VERRUCA PRISCA. 525 



labnim is decidedly bullate, triangular in section, with a 

 row of minute bead-like teeth on the crest ; the palpi are 

 very narrow and short, and do not nearly touch each other : 

 this variation in the structure of the labrum and in the size 

 of the palpi, is very remarkable, considering how important, 

 in a classificatory point of view, these parts are in all other 

 Cirripedes. In the mandibles there are either two or three 

 main teeth, with the whole lower part of the organ pecti- 

 nated with sharp spines. Cirri : the first pair is not short ; 

 in the individual examined, the two rami had eleven and 

 twelve segments. In the second pair, the shorter ramus 

 was two thirds of the length of the longer ramus, the seg- 

 ments being in number ten and fifteen ; in the arrangement 

 of the spines this second pair resembles its homologue in 

 the three other species. In the third pair, the two rami are 

 very nearly equal in length, having sixteen and eighteen 

 segments ; and the segments of the anterior ramus are only 

 a little thicker and more thickly clothed with spines than 

 those of the posterior ramus. The remaining cirri and the 

 caudal appendages are as in the other species. 



5. Verruca prisca. PI. 21, fig. 4. 



Verruca prisca. Bosquet. Monographic des Crustaces fossiles 



du Terrain Cret. de Limbourg, Tab. 1, 

 fig. 1—6; 1853. 



Shell smooth : moveable scutum, with the lower articular 

 ridge somewhat broader than the upper articular ridge. 



Fossil — c Systeme Senonien et Maestrichtien/ Belgium, Mus. Bosquet ; in 

 Chalk, Norwich, Mus. J. de C. Sowerby. 



M. Bosquet has admirably figured and described the 

 several separated valves belonging to this species, and I 

 owe to his great kindness an examination of some of them. 

 In Mr. J. de C. Sowerby's collection, also, there is a single 

 specimen, attached to a Mollusc, with the four valves of the 

 shell united together, but without the two moveable oper- 

 cular valves; it cannot be positively asserted that this is the 

 same species with that of M. Bosquet, but such probably is 



