554 EEPORT OF COMMISSIONER OF FISH AND FISHERIES. 



In life the males are seinitranslucent and nearly colorless, while in the 

 females the antennula?, the flagella of the antenna?, the ocular pedun- 

 cles, the thorax with the marsupial pouch, and the articulations of the 

 caudal appendages are beautiful rose color. 



Length of a male, 6.0 mm ; carapax along the dorsal line, 1.8 ; antennal 

 scale, 0.70 ; telson, 0.90. Length of a female, S.5 mm ; carapax, 2.5 ; an- 

 tennal scale, 0.88 ; telson, 1.16. 



The absence of the sexual appendages from the anteunulre of the male, 

 the peculiar structure of the anterior legs, and the similarity of the 

 abdominal appendages in the two sexes, at once separate the genus 

 Heteromysis from all known allied genera. 



Thysanopoda, species. (152.) 



A great number of small specimens were taken from the stomach of 

 mackerel caught twenty miles off No Man's Land, July 18, 1871. 



Several were also caught swimming at the surface in Vineyard Sound, 

 April 30, 1873, by Y. N. Edwards. 



A single specimen of a species apparently the same as this was taken 

 ^at New Haven, Connecticut, May 5, 1873, by Professor D. C. Eaton. 



CUMACEA. 



Diastylis QUADRISPINOSA, G. Q. Sars. Plate III, iig. 13. (p. 507.) 

 Ofversiglit af Kongl. Vet.-Akacl. Forh., 1871, Stockholm, p. 72. 



Dredged in 23 fathoms of Martha's Vineyard and in 29 fathoms of 

 Buzzard's Bay. It is also found in the Bay of Funcly. Sars's specimens 

 were dredged by the Josephine expedition in 18 fathoms off Skinnecock 

 Bay, Long Island, and in 30 to 35 fathoms, latitude 39° 54' north, lon- 

 gitude 73° 15' west, off the coast of New Jersey. 



Our specimens agree well with Sars's description, except that the sec- 

 ond segment of the inner ramus of the lateral caudal appendages has 

 but three, or rarely four, spines upon the inner margin, while in Sars's 

 specimens there were five. 



Diastylis sculpta Sars. 



Loc. cit., p. 71. 

 "With the last species, in 18 fathoms, off Skinnecock Bay, according to 

 Sars. 



Diastylis aebreviata Sars. 



Loc. cit., p. 74. 



Rare in 30 to 35 fathoms, off the coast of New Jersey, with the 

 first species, (Sars.) 



EuDORELLA PUSILLA Sars. 

 Loc. cit., p. 79. 



•Not infrequent in 18 fathoms, off Skinnecock Bay, (Sars.) 



