some undescrihed exotic Crustacea. 191 



Fig. 5. a, The tube, of its natural size. 



b, The animal out of its tube. ~ 



c, The animal as it appears in its tube. 



d, The head seen above, showing the palpi. ^ 



e, The superior antennae. -~ 

 e', The tip of the same antennae. 



f, The inferior antennae. 



/', The tip of the inferior antennae on the same scale. 



g, The palpus standing obliquely upwards. 



h, The (maxillary?) palpus which is attached to the parts of the moutli. 

 i, The first pair of legs. 



j, The two ultimate joints with the claw of the second pair of legs, 

 /f. The supplemental legs arising from the joints immediately preceding 

 the tail. 



Caprella {Lam.) scaura. Plate XX. fig. 6. 



Pale brown. Body linear. Superior antennae twice as long as 

 the inferior : the 1st joint thick, contracting a little towards its apex ; 

 2nd elongate, obpyriform ; 3rd very slender and waved ; 4th equally 

 long, with minute spines arising from teeth or elevations on the in- 

 ferior surface, beyond its middle subarticulated. Inferior antennae 

 with the first 2 joints minute ; 3rd elongate, and similar in form to 

 the 2nd of the upper antennae ; 4th of about the same length, waved, 

 and, as well as the last, with a double series of hairs arising from 

 the inferior edge, and increasing in length as they approach the 

 apex of the joint; 5th not so long, tapering, spiny, and articulate. 

 Eyes sessile, compound, in an irregular arch behind the root of the 

 inferior antennae. Head rotund, with an occipital spine, and a pair 

 of feet, 5-jointed, attached behind: a triarticulate claw-bearing pal- 

 pus projects in front. The joint of the body which supports the 

 head is long, cylindrical in the middle, but swollen out at the extre- 

 mities. The second joint of the body is much the longest, tumid 

 posteriorly, and giving attachment at the thickest part to a very elon- 

 gate slender pair of legs. The 1st joint very long and waved, 2nd 

 and 3rd minute ; 4th dilated, especially in the middle, hairy, with two 

 toothlike processes inferiorly and a large dentate claw articulated to 

 its apex. The two next joints of the body are shorter and rather 

 thicker than the anterior, and have attached, a little beyond their 

 middle, at a part which juts out, two vesicular appendages, which are 

 narrow, ovate, and scarcely so long as the joint from which tliey ori- 

 ginate. The three last joints give attachment posteriorly to three 

 pairs of legs, successively longer, monodactyle and hairy ; the 1st leg 

 has five joints, the 2nd six, and the last four. Two small spines 

 arise from near the base of the ultimate joint in each leg. 



From the tip of the antennte to the claw of the hind leg measures 



