178 Bulletin, Vanderhilt Marine Museum, Vol. Ill 



Synalpheus longlcarpus (Herrick). 

 Plate 65. 



Type: Collected in the Bahama Islands, inhabiting the tubes and 

 cavities of two species of sponge, a green and a brown kind. 



Distribution: Frequently inhabits the loggerhead sponge. Re- 

 ported from North Carolina, Florida, the Gulf of Mexico, Yucatan, 

 Porto Rico, Jamaica, Curagao and Haiti. 



Material examined : Five specimens, taken from sponge, Carenge 

 Bay, Le Mole, Haiti, February 4, 1924, by the "Ara," William K. 

 Vanderbilt, commanding. 



Technical description: Rostrum a little longer than the obtuse, 

 triangular orbital spine and extending two-fifths of the length of the 

 first antennular article and separated from the orbital spine by a 

 V-shaped sinus. The cornea are well defined, blackish. The antennulae 

 have the basal article one and one-half times as long as the third 

 article. The acuminate stylocerite reaches the distal margin of the 

 third basal article. The carpocerite is slender and cylindrical, slightly 

 excurved, five or five and a half times as long as wide and extending 

 beyond the antennular peduncle by about the length of the third 

 antennular article. The scaphocerite has the lateral spine strong, 

 acute, usually exceeding the length of the antennular article by about 

 half the length of the third article. The scale is rudimentary, when 

 present, usually no longer than the basal antennal article and less 

 than half as wide as the lateral spine ; frequently entirely obsolete. 



The sixth abdominal segment is produced on the posterior angle to 

 a strong triangular lateral tooth. Both branches of the uropoda are 

 wide, convex, a little longer than the telson. The telson is longer and 

 narrower than that of ;S'. goodei, with the tip very narrow and slightly 

 rounded and ciliate. 



The great cheliped is ovate, elongated, the margin moderately con- 

 vex, the posterior part dilated and prolonged backward beyond the 

 articulation; the carpus is small, cup-like, beyond the central axis of 

 the palm. There is a small, acute spine at the anterior distal, dorsal 

 margin of the palm. The fingers are strong, about one-fourth the 

 total length of the palm; the dactyl is a trifle oblique distally. The 

 larger claw is two and one-half to three times as long as the smaller 

 one ; the latter has the propodal finger with two short, angular promi- 

 nences in addition to the apex ; the dactyl has two teeth, the lower of 

 which is the stronger. The carpus varies in length. The merus is 

 about four times as long as wide. 



