REPORT ON THE CRUSTACEA MACRURA. (565 



The mandible carries a three-jointed synaphipod, the first joint of which is stouter 

 than the two following; the psalistoma is long and slender, and separated from the short 

 robust molar process. 



The second pair of gnathopoda is tolerably robust and long. 



The first pair of pereiopoda resembles it in form, but is shorter and more feeble and 

 furnished with a few serrate spines at the carpal articulation. The second pair of 

 pereiopoda is long and slender ; the propodos is short and not broader than the carpos, 

 which is long, slender, and multiarticulate, the articuli being numerous and short ; the 

 meros is also multiarticulate, the condition becoming very evident when the joint is treated 

 with a reagent. The third pair of pereiopoda has the meros long and fringed with short 

 spines, the carpos robust and anteriorly produced over the propodal articulation, the 

 propodos more slender than the carpos, long and fringed with short spines, and termin- 

 ally a long, strong, slightly curved dactylos that is armed with two teeth near the base 

 on the inner or posterior margin. The fourth and fifth pairs of pereiopoda resemble 

 the third but decrease in size posteriorly. 



The pleopoda are strong and powerful appendages ; the terminal pair, which forms the 

 outer plates of the rhipidura, has the inner plates narrower than the outer, which are 

 furnished with a diseresis that is armed on the outer margin with a free long spine and a 

 short fixed tooth. 



The telson is long, narrow, and tapering ; it is armed on the dorso-lateral surface 

 with six or seven short spines, and terminally with six, two of which are short and sub- 

 central, two long, situated at the angles, and two very short and planted on the lateral 

 maro-ins outside the ansies. 1 



Pandalus, Leach. 



Pandalus, Leach, Malacos. Pod. Brit., tab. xl. 



„ Milne-Edwards, Hist. Nat. Crust., torn. ii. p. 383. 



Anterior portion of the carapace carinated and produced to a long rostrum that 

 is armed on the dorsal or upper surface with movable spines, intermingled with hairs, 

 and on the lower surface with fixed and rigid teeth. Frontal margin without an orbital 

 tooth, but having a long antennal tooth and a small tooth corresponding with the antero- 

 lateral angle of the carapace. 



Pleon smooth, compressed or narrow posteriorly. Third somite laterally more 



1 Since the above description was in type I have received from Dr. Bruce a specimen of an immature Macrura, 

 captured tins summer in the Mediterranean, off Malta, which is apparently nearly allied to this species, but certainly 

 does not belong to it. The teeth on the dorsal crest are armed on their anterior margin with numerous small reversed 

 teeth. The rostrum is smooth, and there are only three teeth on the crest of the carapace, and one on each side behind 

 the orbit is quite as large and more boldly serrate than those on the dorsum. 



For the purpose of identification I propose to call this latter form Odontolophus serratus, on the assumption that it is 

 the young of some undescribed genus. 



(ZOOL. CHALL. EXP. — PART LIL 18S7.) Fff 84 



