Explanation of Plate VII. 



Fig. I. Pilumnoplax americanus, 6, X J \- 



Fig. 2. Pilumnoplax americanus, $, front, X 2. 



Fig. 3. Chasmocarcinus typicus, 8, X 2. 



Fig. 4. Chasmocarcinus typicus, &, abdomen and sternum, flattened, X 2. 



Fig. 5. Chasmocarcinus typicus, $, outer maxillipeds, X 2. 



Fig. 6. Chasmocarcinus obliquus, carapace of 5, X 2. 



