90 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxvi. 



The basicerite bears two very short spines, the inferior a little longer, 

 but not attaining the extremity of the frontal spines. The scale of 

 the carpocerite is large, its lateral spine equals the carpocerite, which 

 is 3.7 times as long as wide, and scarcely surpasses the antennules. 



The distal article of the outer maxillipeds is only 3.6 times as long 

 as wide, this proportion being 6 times in S. minus, for example. 



The proportions of the large chela are : Fingers 1 ; total length 3.5 ; 

 height 1.4. It tapers from behind forwai'd, and bears a weak conical 

 prominence on the palm, continuing the upper margin. Meropodite 

 very thick and unarmed, only twice as long as wide. 



The small chela, the carpus of which is short, has the following pro- 

 portions : Fingers 1 ; total length 3 ; height 1. The fingers end in an 

 obtuse point. 



The second pair is slender, the first segment of the carpus longer 

 than the sum of the 4 others, the distal chela small. The following 

 feet are also slender, the meropodite being 4.5 times as long as wide. 

 The dactyl is elongate and is terminated by two parallel hooks, the 

 ventral a little shorter and thicker, a form which recalls the species 

 of the Paulsoni group. 



The telson is like that of the species of this group, its posterior mar- 

 gin being very little convex. 



Laysan Island, 10 to 19 fathoms. Albatross Station No. 3960, 1 

 female, 9 mm. long, type, Cat. No. 38344, U.S.N.M. 



SYNALPHEUS CHARON (Heller). 



Hawaiian Islands, Albatross Stations Nos. 3955, 3962, and 4073. 



SYNALPHEUS PARANEOMERIS Coutiere. 



Hawaiian Islands, Albatross Stations Nos. 3921, 3960. 



SYNALPHEUS GRAVIERI Coutiere. 



Southern Japan, Albatross Station No. 3729. 



SYNALPHEUS L.ffi:VIMANUS (Heller). 



Adriatic Sea. 

 Shanghai. 



SYNALPHEUS NEOMERIS de Man. 



DESCRIPTIONS OF NEW EXTRA-AMERICAN SPECIES MENTIONED 

 IN THIS PAPER, BUT NOT IN THE COLLECTION OF THE UNITED 

 STATES NATIONAL MUSEUM. 



SYNALPHEUS MEROSPINIGER, new species. 



Very near S. neomeris de Man, differing especially in the dactyl, the 

 two hooks of which are almost equal. The supraorbital spines are 

 also wider, the antennular peduncle more robust (ratio of length to 



