The Xiiinoda. 147 



in the female. But the relations of the species among themselves 

 are rather complicated, since the type species, G. carinatus, agrees 

 only with Li. hcvis in having no exopods on the third and fourth 

 peraeopods of the male, while G. lav is is separated from the type 

 and Dr. Caiman's other two species, G. costatus and G. bicristatus, 

 by having the inner ramus of the uropods simple. A family 

 Dicidae, with the new genus and species Die calmani, was 

 instituted in the General Catalogue of South African Crustacea, 

 published in 1910, and Die tubulicauda (Caiman), is accepted by 

 Dr. Thomas Scott. 



GEN. DIASTYLIS, Say. 



1818. Diastylis, Say, J. Ac. Sci. Philad., vol. i., p. 313. 

 1900. D., G. 0. Sars, Crustacea of Norway, vol. iii., p. 42. 



Pseudorostral lobes with antero-lateral corners usually little pro- 

 duced; telson long, post-anal portion narrowly produced, elongate, 

 with several pairs of lateral spines ; second antennas of adult male 

 very long ; third maxilliped with exopod in both sexes ; third peraeo- 

 ppds not widely separated from the second in the adult female ; both 

 pairs of pleopods in the male well developed, the outer ramus two- 

 jointed. 



The genus ParadiastyUs, Caiman, 1904, has no exopod on the 

 third maxilliped of the female, and the adult female of Diasty- 

 lopsis has the second and third perteopods widely separated. Dis- 

 tinguishing points of other genera in the family are noticed under 

 other headings. Diastylis itself, after all the deductions here made, 

 still contains thirty-three species. In six of these the third and 

 fourth peraeopods of the female have rudimentary exopods. In the 

 remainder these rudiments are regarded as wanting, but it is an 

 open question in regard to D. tricinctus, Zimmer, 1903, only known 

 in the male, and D. annutiix, Norman, for which these peraeopods 

 have not been described. 



DIASTYLIS ALGO^:, Zimmer. 

 1908. Diastylis algoce, Zimmer, Deutsch. Tiefsee-Exp., vol. viii., 



p. 188, pis. 44, 45, tigs. 96-108. 

 1910. D. a., Stebbing, S.A. Crustacea, pt. 5, Annals S.A. Mus., 



vol. vi., p. 418. 



Three numbers should be added to the stations from which this 

 species was obtained by Dr. Gilchrist, namely, 78, 83, 131, the 

 localities being respectively lat. 33 54' 15" S., long. 25 P 53' 30" E., 



