MUSEUM OF COMPARATIVE ZOOLOGY. 147 



other spines, and several spinuliform tubercles on the supero-exterior sur- 

 face. Hand costate, there being three ridges on the outer, two on tbe 

 upper, and one on the inner side ; of the superior ridges, the outer one is 

 armed 'with five spines, and the inner one is denticulated, with a long 

 spine at the summit anteriorly ; fingers nearly as long as the palm, and 

 strongly toothed within, the teeth being four or five in number on each. 

 Ambulatory feet of the third pair two and a half times as long as the 

 carapax. Colors : Body greenish ; ambulatory feet white. 



Dimensions : Length of carapax, 0.58 ; breadth, including the lateral 

 spines, 1.10; excluding the spines, 0.C8 inch; proportion of length to 

 latter breadth, 1 : 1.17 ; length of third pair of ambulatory feet, 1.45 inch. 



Off Sand Key, May 15, 1868. Cast No. -. 100 fathoms. 



Off Key West, April 21, 1869. Cast No. 5. 120 " 



Off American Shoal, May 8, 1868. Cast No. 3. 150 " 



Bathynectes brevispina nov. sp. 



This species greatly resembles the typical form in color and most other 

 characters, but differs in the following important particulars : The carapax 

 is more convex, and the transverse ridges are less prominent. The antero- 

 lateral teeth are much smaller and shorter, the second, third, and fourth 

 teeth being only half as long as the distance between their bases, and the 

 posterior tooth (lateral spine) equalling in length only one seventh the 

 wi 1th of the carapax, excluding the spines. 



The dimensions of the only specimen in the collection — a female — 

 are : Length of carapax, 1.96 ; breadth, including the lateral spines, 2.95; 

 excluding the spines, 2.40 ; proportion of length to latter breadth, 1 : 1.22. 



The specimen was taken in 107 fathoms, off' the Marquesas, February 

 11, 1869. 



It was at first regarded as a large female of B. longispina, but the differ- 

 ences between the two forms are so much greater than is usual between 

 the sexes in Portunidae, that I have preferred to consider them dis- 

 tinct, until the question can be decided by the acquisition of additional 

 materials. 



Subfamily LUPIN/AE. 



Neptunus Sayi Stm. 

 Lupa pelagica Say, Jour. Acad. Nat. Sci. Philad., I, 97 (1817). 

 Lapa Sayi Gibbes, Proc. Am. Assoc. Adv. Sci., 1850, p. 178. Dana, TJ. S. 



Expl. Exped., Crust., I, 273, pi. xvi, fig. 8. 

 Neptunus Sayi Stimpson, Notes on N. American Crustacea (1860), p. 92. A. 

 Milne-Edwards, Arch, du Mus., X, 317, pi. xxix, fig. 2. 

 Found on Gulf weed, January 18, 1869. 



