348 GKNUS — L1TH0TRYA. 



the surface of attachment, and possessing the power of 

 slight movement. 



We will now proceed with our generic description. — 



Animal's Body. — This, as already stated, is partially 

 lodged within the peduncle. The prosoma is rather largely 

 developed. 



The Mouth is placed at a moderate distance from the 

 adductor muscle. 



The Labrum is moderately bullate, with a row of blunt 

 bead-like teeth, mingled with fine bristles, on the crest, 

 which in the middle part is generally somewhat flattened. 



The Palpi are blunt, and even squarely truncated at 

 their ends; they are of large size, so that, if they had been 

 half as large again, or even less, their tips would have met. 



Mandibles (PL X, fig. 2), with three nearly equal large 

 teeth, and the inferior angle produced, broad, and strongly 

 pectinated : in the interspaces between these teeth there 

 are, in all the species, some very fine teeth or pectinations, 

 which are seated a little on one side of the medial line. 

 The mandibles are somewhat singular from the size of 

 the transparent flexible apoclemes (a a) to which the 

 muscles are attached; these are oval and constricted at 

 their origins : in L. dorsalis they are roughened with little 

 points ; in L. cauta and L. truncata they are large, of the 

 same shape, but smooth. 



MaxillcB. — These are larger, compared to the mandibles, 

 than is usual with pedunculated Cirripedes ; they differ in 

 shape in the different species, being either nearly straight 

 on their edge, and notched or not (fig. 10), or notched with 

 the inferior part forming a double prominence (fig. 12); 

 the spines on the inferior angle, which is sometimes 

 slightly produced, are always crowded together into a 

 brush, and are finer than those on the upper parts. The 

 apoclemes are less straight than is usual, and at their 

 origin take, in all the species, a rather abrupt bend ; 

 their extremity is enlarged into a little disc, which in 



