170 Mr. T. H. Withers on some 



sliowu iu Bosquet's figures renders it very probable that tbe 

 plates were attached precisely as in B. naissanti, one cannot, 

 in the absence of the original specimens, say definitely that 

 this is the case. The scutum, and the upper latus espe- 

 cially — if, iudeedj it be an upper latus, — depart widely from 

 the type of valve seen in B. 7inissanti, but I am not at all 

 convinced that they belong to B. lithutryoides. Siuce it is 

 likely, however, that the carina and rostrum ( = Eosquet^s 

 subrostrum) with the imbricating plates at the base combined 

 to build up a shell in the same way as in B. naissanti, tlie 

 species may be left, at any rate provisionally^, in the genus 

 Brachylepas. 



Type. I have so far been unsuccessful in tracing tlie type- 

 specimens of this species. Prof. K. ]Martin, in answer to an 

 enquiry, says that they are not in the Geological ]\Iuseum 

 of the University of Leyden, aud Prof. Eugene Dubois 

 informs us that they are not in Teylers Stichtiug, Haarlem. 

 I select the original of Bosquet's figure 6 a-c, a carina, as 

 the holotype. 



Distribution. Maestrichtian : between Vilt and Sibbe, 

 Nedercauue, Bemelen, Geulhem, and at iSt. Pierre, Ducliy of 

 Limbourg, Holland. 



Measurements. The carina figured by Bosquet (pi. iii. 

 fig. 6 a-f/) appears to be the largest known valve, and the 

 length of ihis is given as 13 mm., which apparently includes 

 the imbricating plates at the base. 



Family Pollicipedidae. 



PycNOLEPAst, gen. nov. 



Pollicipeds in which the capitulum is composed of a single 

 whorl of 8 valves, namely, a long and narrow carina, paired 

 scuta, paired upper latera which are long and narrow and 

 overlap the scuta and terga on either side, paired terga, and 

 a rostrum nearly as large as t'le carina. Peduncular plates 

 large. 



Genotype. Pollicipes rigidus, J. de C. Sowerby. 



Pycnulepas rigidus, J. de C. Sowerbv, sp. 

 (PI. Vll. figs. 15-19; PL VIII. figs.' 1-4.) 



1836. Pollicipes rigidus, J. de C. Sowerby, Trans. Geol. Soc. 2nd ser. 

 vol. iv. p. ci35, pi. xi. tig. 6*. 



. > 

 t 7ri;/<i'Cf = compact. 



