REPORT ON THE CRUSTACEA MACRURA. 625 



the carpos is long and slender, but of greater diameter at the propodal extremity, where 

 it is armed on the under surface with a sharp, spine-like tooth ; the propodos is long and 

 slender, not being broader than the distal extremity of the carpos ; the fingers impinge 

 closely and correspondingly. The second pair of pereiopoda is twice as long as the 

 first. The ischium and meros are together as long as the first pair of pereiopoda, and are 

 much more robust, but have no tooth at the lower distal angle ; the carpos and propodos 

 become suddenly more slender, and when at rest lie folded against the more robust basal 

 joints, with which they agree in length ; the carpos is long, slender, and cylindrical, and 

 when extended is curved in an inverse direction to the basal joints, with which it corre- 

 sponds when reflexed ; the propodos is about a third of the length of the carpos, of 

 somewhat less diameter, slightly curved, and terminates in a slender, long, fringed 

 chela. The third pair of pereiopoda is not so long as the second, but more robust 

 throughout, and is armed with a sharp tooth at the infero-distal extremity of the meros ; 

 the carpos is long and cylindrical, and so is the propodos, but not so long as the carpos ; 

 the dactylos is stout, bidentate, and embedded in a brush of hairs. The fourth and fifth 

 pairs resemble the third, but are each successively shorter. 



The pleopoda are short, stiff, subfoliaceous, and biramose. 



The rhipidura is strongly developed, the telson being nearly as long as the lateral 

 plates, the outer of which is armed with a tooth and a spinule corresponding with the 

 extremity of the feebly marked diseresis, and the extremity and inner margin are fringed 

 with long hairs. 



The only specimen obtained is a female, laden with numerous eggs of a slightly ovate 

 form and of moderate size. 



Our specimen was taken off Barra Grande, on the eastern coast of South America. 

 M. Guerin-Meneville * figures a species under the name of Hippolyte elongatus. that 

 corresponds much with this species, particularly in the form of the rostrum, which, 

 however, is long and smooth on the lower margin, whereas in Ampliiplcctus depressus 

 there are six small but well defined and widely separated teeth. 



The habitats of these two species are in the same geographical region, and it is not 

 improbable that they may belong to the same genus. 



Family Pandalidj. 



Animal laterally compressed. Carapace not more than one-third the length of the 

 animal, and anteriorly produced to a long and slender rostrum, more or less abundantly 

 armed with teeth or spines. The ophthalmopoda are well developed but not remarkable 

 for size. The first antennas are biflagellate. The second are long and carry a well- 

 developed scaphocerite. The second pair of gnathopoda is pediform. The first pair of 



1 Atlas, Zoologie de l'lle de Cuba, pi. ii. 



(ZOOL. CHALL. EXP. PART LII. — 1887.) Eff 79 



