nn^ on Six New Spt^cles of CruHacoi, S^c. 18f^ 



tubercle surmounts its dorsal surface. Tlie feraoral joint is very short 

 and robust— it is angular, that is to say, bearing three ridges ; last 

 joint is large and oval, serrated on its inferior edge ; a large tubercle is 

 situated near the base ; the claw is short but powerful. The second 

 and third thoracic segments are of the same length, second more slen- 

 der : branchial lamella3 are short, and arise considerably behind the 

 middle, and a blunt tubercle arises from the dorsum of the segment 

 immediately above the origin of each. Fourth joint is very rough — it 

 is armed with a tubercle on its dorsal surface at its anterior edge ; 

 another larger and flatter one Immediately below this on its lateral 

 surface, and four other sharper ones placed in the figure of a square 

 at its posterior part. The two following joints are pediculated, and 

 bearing two sharp spines on each. All the joints of the posterior tho- 

 racic legs are powerfully clavate, which gives them a serrated appear- 

 ance ; a short strong tooth arises from the inferior edge of the last 

 joint near the base. 



This species is apt to be confounded with the Caprella 

 acanthifera of Leach, but may be distinguished from it by the 

 double fringe of spines on the lower edge of the inferior an- 

 tennae ; the superior antennae are also much shorter than those 

 of the acanthifera. 



Body free from Spines. 

 Plate III. Fig. 4. 



Caprella Icevis. — Body without spines. Superior antennae not reacihing 

 the origin of the second pair of legs ; last joint composed of six arti- 

 culations. Head almost triangular ; post-occipital segment four times 

 as long as the head. Swelling on the first thoracic segment near the 

 posterior edge ; coxal joint large produced. Length, one inch. 



Description, — The whole body is quite smooth, shining, and free of spines. 

 The head is almost triangular. Eyes near the upper surface and very 

 small. The superior antennse are very short and strong : third joint 

 very strong, and as long as the two following : last joint composed of 

 thirteen articulations. Inferior antennee not so long : the two first joints 

 very short : inferior edge of all the articulations armed with a strong 

 fringe of double spines. Front pair of legs strong, and almost as long- 

 as the lower antennse. 



Post occipital segment slender, and four times as long as the head. First 

 thoracic segment very long, slender at its anterior extremity, and with 

 the swelling entirel}^ situated at its posterior extremity. Second pair 

 of legs arises from the anterior part of the swellings : coxal joint large 

 and produced : femoral joint considerably bent and slightly clavate : 

 last joint oblong ovate and armed on its inferior edge with two spines, 

 one near, or rather at the middle, which is smallest, and the other about 

 lis own length from the anterior extremity : a number of denticle^ and 



