NO. 1G50. AMERICAN SPECIE t^ OF SYNALl'IIEVS—COLITIEItE. 35 



Localities — Contimied : 



Brazil, Baliia, Ilartt Expedition, Station No. 173. 



Hawaiian Islands, French Frigate Shoal, 15 to 1(5 fathoms, 

 Alhatross Station No. 30()0. 



Southern part of Gulf of California, 9i- fathoms (type of form 

 mexicanus) , Albatross Station No. 2820. 



Lower California (form hrevispinls)^ M. Diguet (Paris Mu- 

 seum ) . 



Type of .S'. toicusendi—Csit. No. 38392, U.S.N.M. 



Type of S. townsendi productiis. — Cat. No. 9798, U.S.N.M. 



Type of aS'. townsendi mcxicanus. — Cat. No. 38393, U.S.N.M. 



S. townsendi is particularly close to S. paraneonieris Coutiere, a 

 form with basicerite unarmed above, which also presents variations 

 in the armature of that article, as does an " oxyceros " form. The 

 difference consists principally in the supernumerary ventral promi- 

 nence of the dactyls, absent in S. townsendi^ but very characteristic of 

 the NEo:\rERis group, where a great number of species possess it. S. 

 paraneonieris is one of the most widely distributed species of the 

 Indo- Pacific region. 



NEOMERIS Group. 



SYNALPHEUS FRITZMIJLLERI, new species. 



Rostrum slender, quite distinct from the lateral spines, the margins 

 nearly parallel for half their length; lateral spines with sharp points, 

 generally a little shorter than the rostrum, reaching to the middle of 

 the basal antennular article. 



The articles of the antennule are in the proportion : 1.5, 1.1, 1, 

 beginning at the base ; the external fiagellum is bifurcate beginning 

 at the eighth article; the stylocerite equals one-half of the median 

 antennular article. 



The basicerite of the antenna3 bears on the upper side a strong spine, 

 laterally a longer spine, a little shorter than the stylocerite; the an- 

 tennular scale is narrow (6.6 times longer than Avide) , its sharp lateral 

 spine reaching the extremity of the carpocerite, which surpasses the 

 antennule by about half the distal article and is a little swollen and 

 only three times longer than wide. 



The external maxillipeds reach forward to the bifurcation of the 

 external antennular fiagellum. 



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

 length 3.15 to 3.3; height 1.25; the anterior margin of the palm bears 

 an obtuse prominence; the meropodite is 2.3 times longer than wide, 

 its inferior margin terminating in a strong triangular point. 



