REPORT ON THE CRUSTACEA MACRURA. 325 



the first, and the third is half the length of the second and supports at its extremity two 

 flagella. The inner branch is the primary and is multiarticulate ; the articuli, which are 

 very slender and long at the extremity, become gradually shorter as they approach the 

 base, where, instead of continuing extremely narrow, they coalesce into one bulb-like 

 mass, from which a number of long and slender membranous hair-like organs spring. 

 The outer branch is more slender ; if it is formed of more than one articulation, as 

 presumably it is, the divisions between them are not visible. 



The oral appendages have not been examined. 



The second pair of gnathopoda consists probably of seven joints. The basis and coxa 

 are short and not visible in the mounted specimen ; the ischium is moderately long and 

 free from spines ; the meros is smooth on the upper margin and armed with five smooth 

 articulated spines on the lower margin ; the carpos is longer than the meros, furnished 

 on the upper surface submarginally with several minute spines, and on the lower with 

 seven or eight long and slender spines that stand upon and articulate with a series of 

 prominences like truncated points. The propodos is shorter than the carpos, somewhat 

 irregular in form, the upper surface being waved or bent and the lower strongly 

 tuberculated, each tubercle supporting a strong sharp spine ; the upper margin armed 

 with a few stiff hairs or spines which are not elevated on tubercles. The dactylos is 

 half the length of the propodos; it is narrower than the preceding joints, bearing on 

 the upper margin two small, spine-like hairs, and three on the lower, and tipped at the 

 extremity with a long, straight, articulated spine. 



The first pair of pereiopoda has the lower margin of the ischium fringed with eight or 

 nine strong hairs, springing from small prominences that gradually increase in size 

 anteriorly, and the upper margin with a row of small spines or short hairs which stand 

 on very small eminences, more apparent anteriorly than posteriorly ; the meros is half the 

 length of the ischium, and is armed above and below with long spines that stand on well- 

 defined prominences, more especially on the lower margin, where they are also longer 

 than on the upper. The carpos is shorter than the meros, without spines on the upper 

 margin and with only two large and strong ones on the lower. The propodos is short, 

 a little shorter than the carpos; it is armed on the upper surface with four spines standing 

 on tubercles, and with one spine at the anterior margin on a prominent tubercle; 

 immediately behind which is a prominent, smooth-tipped tubercle, that is developed as 

 a pollex, and against which probably when fully developed the dactylos has the power 

 of being flexed. The dactylos is short, narrow, and feeble, and tipped with a long and 

 slender articulated spine. 



The second pair of pereiopoda I have not fully made out, but the carpos is 

 long, cylindrical, and furnished with a few slender hairs on the upper side near 

 the meral extremity, and anteriorly smooth and free from hairs. The propodos is 

 shorter than the carpos and is at the lower distal extremity produced to a blunt 



