88 LEPAS PECTINATA. 



Filamentary Appendages, none, or only one, short, 

 obtuse projection on each side, on the posterior face of 

 the swelling under the first cirrus. 



Mouth. — Mandibles, with the inferior point produced 

 into a single pectinated tooth, rarely into two pectinated 

 teeth ; on one side of one specimen, there were only four 

 instead of five teeth. Palpi very narrow. Maxillae highly 

 variable ; they may be described as formed of five steps, 

 of which the two lower ones are generally united into a 

 single one, divided by a mere trace of a notch ; or with the 

 three lower steps blended into an irregular, projecting 

 surface, and with even the fourth step indistinct. I have 

 seen these two extreme forms on opposite sides of the 

 mouth of the same individual, — on one side the maxillae 

 being regularly step-form, on the other the whole inferior 

 part forming an almost straight edge, standing high up 

 above the first notch or step which bears the two upper 

 great spines. 



Cirri. — First pair rather far removed from the second 

 pair, with the longer ramus about three-fourths of the 

 length of shorter ramus of second cirrus ; spine-bearing 

 surfaces, hardly at all protuberant ; lateral marginal spines 

 on the posterior cirri rather long; caudal appendages 

 smooth, rounded, extremely minute : penis very spinose. 



Size. — Capitulum in the largest specimen, six-tenths of 

 an inch long ; only a few arrive at this size. 



Colours, after having been kept in spirits, — sack and 

 cirri, especially first cirrus, clouded with pale purple; 

 peduncle brownish ; valves appear blueish in specimens 

 not long preserved, but in specimens kept longer they 

 become perfectly and delicately white. 



General Remarks. — Under the head of L. anserifera, I 

 have made some remarks on the diagnostic characters of 

 this species. In the thinness of the valves, — form of the 

 carina, with the rim connecting the prongs being not, or 

 scarcely, reflexed, — and in the shortness and narrowness 

 of the peduncle, there is some approach to L. australis, 

 and thence to L. fascicularis. In the form of the maxillae, 



