TANAIDACEA AND ISOPODA— TATTERSALL. 227 



Zealand waters, I think that there can be little doubt that the species are synonymous. 

 Hansen's re-description of the genus and species is sufficient for easy recognition. The 

 type of C. typa came from New Zealand, Thomson's specimens from the Bay of Islands, 

 and Hansen has recorded the species from Akaroa Harbour. 



Family SEEOLIDAE. 



Genus SEROLIS, Leach. 



34. Serolis schythei, Liitken. 



S. schythei, Lutken, 1858, p. 98, pi. I, figs. 12, 13; Grube, 1875, p. 220, pi. Y, fig. 1, pi. VI, 

 fig. 1 ; Beddard, 1884, p. 40, pi. II, figs. 5-13. 



Occurrence.— ^la.\,io\i 38, 52° 23' S., 63° 50' W., near the Falkland Islands, 

 125 fathoms, Agassiz trawl, bottom fauna, two males, four females and eighteen 

 juveniles. 



Remarks. — Both male specimens measure 22 mm. in length and 25 mm. in 

 greatest breadth, while the females, with eggs, measure 21 mm. long and the same in 

 greatest breadth. Adult males are therefore proportionately broader as compared with 

 females. The first four free thoracic somites (3-6 thoracic somites) have their coxae 

 marked off from the terga by a distinct suture. Liitken, Grube and Beddard have all 

 noted the differences between the sexes in this species. In the male the coxae 

 of the seventh thoracic somite reach backward some considerable way beyond the apex 

 of the last abdominal somite, while the coxae of the sixth thoracic somite and the 

 pleura of the second abdominal somite extend backward equally to the apex of the last 

 abdominal somite. In the female, the coxae of the seventh thoracic somite reach, 

 and those of the sixth thoracic somite and the pleura of the second abdominal somite 

 fall some considerable way short of the apex of the last abdominal somite. The 

 dactylus of the second thoracic limb in the female has a comb of short spines on the 

 distal half of the inner edge. 



Eichardson (1911, p. 396, fig. l) has recently described a species of Serolis, 

 S. polaris, which is very closely related to S. schythei, but apparently differs in that 

 the pleura of the second abdominal somite are longer than the coxae of the seventh 

 thoracic somite, whereas in S. schythei the reverse obtains, and the transverse carina on 

 the last abdominal somite is of different form in the two species. S. polaris is recorded 

 from the South Sandwich Islands. 5'. schythei is confined to the waters off Patagonia 

 and the Falkland Islands. 



35. Serolis sep>temcarinata, Miers. 



S. quadricarinata, White, 1847, p. 106. 



S. septemcarinata, Miers, 1875, p. 116 ; Miers, 1879, p. 206, pi. XI, fig. 3; Studer, 1884, p. 8; 

 Beddard, 1884, p. 47, pi. II, fig. 14, pi. VIII, figs. 3-5 ; Pfefler, 1887, p. 63, jdI. II, 

 figs. 5, 6, pi. Ill, figs. 1-26, pi. IV, fig. 6 ; Collinge, 1918, p. 74, pis. Ill, IV, figs. 1-13. 



S. ovalis, Studer, 1879, p. 24, pi. Ill, figs. 8-10. 



