NO. 1G59. AMERICAN SPECIES OF SYNALPIIEUS—COUTIERE. 



69 



The telson is like that of S. grainpusi; the outer uropod bears 4 

 to 6 spines. 



The eggs give rise to zoea?. 



Locality: St. Thomas, 20 to 23 fathoms, Fish Hawk Station No. 

 GOTO; 2 males, 4 females. 



Among the specimens is a female which may be considered an 

 '•'' oxyceros''^ form (subspecies extent us) of this species, as the spines 

 of the basicerite and of the scaphocerite ecpuil the antennule, 

 and the antennal scale reaches the end of the median antennular 

 article. S. gram/pusi and 8. parfaiti are equally " oxyceros " rela- 

 tive to S. pandlonis^ Avhich last may be considered as more prim- 

 itive and less adapted to creeping or fixed 

 life on account of the persistent antennal 

 scale, the more feeble feet, the less armed 

 uropods, etc. 



Type of jS. paridionis. — Cat. No. 38400, 

 U.aN.M. 



Type of S. pandionis extentus. — Cat. No. 

 38401, U.S.N.M. 



SYNALPHEUS BROOKSI, new species. 



This species and those following (S. 

 tanneri, S. herricki, and S. pectiniger) 

 constitute in the L^vimanus group a col- 

 lection of forms closely allied, of small size 

 and often associated. In the absence of 

 the small chelipecl it is a difficult matter to 

 separate S. hrooksi and /S. pectiniger, as 

 they both show curious anomalies in the 

 number and size of the eggs; after /S. longi- 

 carpus (in company with which they are frequently found), they are 

 among the most common forms. 



S. hi'oohsi has the tridentate portion of the frontal border distinct, 

 joined to the adjacent portions by slightly concave curves; the three 

 frontal teeth are short and equal, the rostrum narrower; the axes 

 of the lateral teeth are divergent. 



The articles of the antennule are to each other as 1.7, 1.05, 1 ; the 

 stylocerite, short and wide, reaches about the middle of the basal 

 article ; the superior angle of the basicerite is very obtuse, its lateral 

 spine reaching the middle of the median antennular article ; the sca- 

 phocerite is absolutely devoid of a scale and is reduced to its lateral 

 spine, which is more slender and very slightly longer than the pre- 

 ceding; the cylindrical carpocerite, a little concave externally, 

 exceeds the antennule by three-fourths of the distal article; it is 



Fig. 40. — SYNALPHEUS PANDI- 

 ONIS EXTENTUS. a, FKONTAIi 

 AND ANTENNAL REGION ; C, 

 CARPOCERITE. 



