518 PROCEEDINGS OF THE NATIONAL MUSEUM voi,. 99 



Genus BATHYPALAEMONELLA Balss 



BATHYPALAEMONELLA PANDALOIDES (Rathbun) 

 FiGUKE 43 



Palaemon pandaloides Rathbun, Bull. U. S. Fish Comm., vol. 23, pt. 3, p. 924, 



fig. 73, pi. 22, fig. 4, 1906. 

 Leander pandaloides Kemp, Rec. Indian Mus., vol. 27, p. 290, 1925. 



Description.— The rostrum is very long and slender, overreaching 

 the scaphocerite with a large part of its length. The upper margin 

 bears 17 teeth in the proximal half, the distal portion entire except for 

 a subapical tooth. Five or six dorsal teeth of the rostrum are placed 

 on the carapace behind the orbit. The proximal dorsal teeth of the 

 rostrum are shorter and more erect than the distal teeth, which are 

 longer, slenderer, and pressed against the rostrum proper. The lower 

 margin bears 13 teeth, the distals of which are far more widely spaced 

 than the proximals. The carapace is smooth and possesses antennal 

 and branchiostegal spines. The antennal spine is placed slightly be- 

 low the rounded orbital angle. The branchiostegal spine is situated 

 on the anterior margin of the carapace, just like the antennal. No 

 branchiostegal groove is present. The anterolateral angle of the 

 carapace is rounded. 



The abdomen is smooth and has the pleurae of the first five seg- 

 ments broadly rounded. The sixth segment is slightly more than 

 tAvice as long as the fifth and somewhat shorter than the telson. The 

 telson is elongate and provided with two dorsal pairs of spines, which 

 are placed in the middle and at three-quarters of the length of the 

 telson. The posterior margin of the telson is truncate; it is provided 

 with four pairs of spinules, the outer of which are short, the three 

 inner pairs longer and of equal length. 



The eyes are well developed; the cornea is rounded and provided 

 with black pigment. 



The antennular peduncle has the stylocerite large and sharply 

 pointed. Slightly above its base the stylocerite is somewhat broad- 

 ened, and it reaches almost to the middle of the second segment of 

 the peduncle. No anterolateral spine is present at the basal segment 

 of the peduncle. The second segment is somewhat longer than the 

 third. The upper antennular fiagellum is slightly thickened at the 

 base and consists of a single ramus. 



The scaphocerite is long and slender, almost six times as long as 

 broad. The outer margin is concave. The final tooth is strong and 

 reaches about as far forward as the lamella. The antennal peduncle 

 fails to reach the middle of the scaphocerite. A distinct spine is 

 present near the external side of the base of the scaphocerite. 



The oral parts strongly resemble those of Bathypalaemonella zim- 

 meri Balss. The incisor and molar processes of the mandible are 



