A little research turns up that "Sharks exhibit a great diversity in reproductive modes. There are oviparous (egg-laying) species and viviparous (live-bearing) species."
Mermaid's purse: "This name is given to the egg cases of many sharks and skates. This tough, protective purse-shaped egg case contains one fertilized egg. A young shark or skate later emerges from the mermaid's purse. Shark species that utilize this mode of reproduction include the swell shark, dogfish, and angel sharks."
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timeasmymeasure
We're both right
Date: 2006-11-28 09:41 pm (UTC)Mermaid's purse: "This name is given to the egg cases of many sharks and skates. This tough, protective purse-shaped egg case contains one fertilized egg. A young shark or skate later emerges from the mermaid's purse. Shark species that utilize this mode of reproduction include the swell shark, dogfish, and angel sharks."
http://www.flmnh.ufl.edu/fish/education/questions/Biology.html#birth
The dogfish available through the Carolina Biological supply co are not specified, but I bet they are a viviparous species.