658 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.41. 



U. S. F. C. stations 987-989; off Marthas Vineyard; 28-30 fathoms; 

 bottom temperature, 49°-49.5° F.; U.S.N.M. 44092, 44093; 9 females. 



U. S. F. C. station 1025; off Marthas Vineyard; 216 fathoms; bot- 

 tom temperature, 45° F.; U.S.N.M. 34313; 1 female. 



Woods Hole; surface; V. N. Edwards, Bureau of Fisheries; 

 U.S.N.M. Ace. No. 11929; 1 female. 



U. S. F. C. station 811; off Newport, R. L; 19^ fathoms; bottom 

 temperature, 53° F.; U.S.N.M. 44091; 3 females. 



U. S. F. C. station 1240; Block Island Sound; 18^ fathoms; bot- 

 tom temperature, 60° F.; U.S.N.M. 44137; many, female and young. 



DIASTYLIS QUADRISPINOSA G. O. Sars. 



? Cuma hispinosa Stimpson, Mar. Invert. Grand Manan, Smiths. Contr., vol. 6, 



Art. 5, 1853, p. 39. 

 Diastylis quadrispinosa G. 0. Sars, Oefvers. Kgl. Vet. Akad. Forh., vol. 28, 1871, 



p. 72; Kgl. Svenska Vet. Akad. Handl., vol. 9, 1871, No. 13, p. 28, pis. 10, 11, 



figs. 50-61.— S. I. Smith, Rep. U. S. Comm. Fisheries, pt. 1, 1873, p. 554, 



pi. 3, fig. 13; Trans. Conn. Acad., vol. 5, 1879, p. 112. 



Prof. S. I. Smith, while regarding this as the species indicated 

 rather than described by Stimpson under the name Cuma hispinosa, 

 preferred to retain the name given to it by G. O. Sars, and I can per- 

 ceive no advantage to be gained by departing from this precedent. 



A single adult male which I believe to belong to this species is in 

 the collection from Massachusetts Bay. Unfortunately it is much 

 damaged and I am unable therefore to give a satisfactory figure of 

 the entire animal. It resembles in general form the male of D. 

 cornuta ^ as figured by Sars, but the lateral longitudinal ridge of the 

 carapace dies out anteriorly and there is no ridge joining it to the 

 lower edge. On the dorsal surface are two pairs of low tubercles 

 answering to the teeth of the female. The antero-lateral corners are 

 less coarsely dentate than in D. cornuta. The postero-lateral angles 

 of the last thoracic somite are more produced than in the female. 

 The first abdominal somite has a pair of small dorso-lateral teeth 

 (sometimes visible also in the female) on its very concave hinder 

 border. The third, fourth, and fifth abdominal somites have a 

 median dorsal ridge, obscurely serrated, the same somites have also 

 a pair of dorso-lateral ridges which end behind in small spines, 

 most conspicuous in the case of the fifth somite. The telson is of 

 the usual form, a little longer than the uropod peduncles, and with 

 at least twelve pairs of long slender spinules. The peduncle of the 

 uropods has spinules only on the distal half of its inner edge. 



1 1 take this opportunity of noting that the specimens which I recently refeiTed to D. capreensis (Bull. 

 Mus. Hist. Nat. Paris, 1910, p. 181) seem to be only a form of D. cornuta Boeck. I have now examined 

 specimens which are intermediate in many points (e. g., in having the large antero-lateral spines bifur- 

 cate) between these and the tjTiical D. cornuta. In all proliability, the type-specimens of D. capreensis 

 (Mittb. Zool. Stat. Neapel, vol. 17, 190C, p. 429), should also be refen'ed to D. cornuta. 



