HOPLOPARIA. 39 



and a remarkably beautiful one in the Hunterian Collection. The fine claws figured in 

 Plate IX are in Mr. Wetherell's collection, and from Copenhagen Fields. It is about 

 twice the dimensions of R. Belli, and more nearly approximates the common lobster than 

 does that species. It is probable that it would form a very distinct section of the genus, 

 if not actually generically distinct from the last-mentioned species, associated with 

 //. longimana from the Greensand. It is remarkable that the first notice and figure of this 

 species should have occurred in the Catalogue of a Frenchman's collection published nearly 

 a century ago, and that it should have remained wholly undescribed in this country until 

 the year 1849. 



HoPLOPARiA Bklli, M'Coij. Plate X, figs. 1 — 9. 



Pedibus anticis laevibus, gracilibus, minore fihformi, digitis minute denticulatis. 

 Abdomine polito. 



HoPLOPARiA Belli, M'Coy. Mag. Nat. Hist., 1849, p. 1/8. Morris, Cat. Brit. Foss., 

 2d edit., 1854, p. 109. Cat. Fosa. Invert., Mus. Roy. Col. 

 Surg., 1854. p. 177. 



Descr. The carapace in this species is somewhat compressed, slightly incurved at the 

 inferior margin, the outline of which forms nearly an accurate arc of a circle ; the rostrum 

 is awlshaped, acute, about one fourth the length of the carapace, with a slight groove, 

 which at the base is interrupted by a small carina or elongated tubercle; there are 

 two tubercles on each side of the anterior part of the carapace, just behind the upper 

 margin of the orbits, and another on the process which covers the base of tlie antennal scale; 

 this process is arched, minutely granulated at the margin, and partly embraces the origin 

 of the antennal scale ; this structure I have with much care and some difficulty cleared 

 away in several specimens, sufficiently to show that in its general form and character 

 it bears a considerable resemblance to the same part in Homarus and Nephrops, and none 

 whatever to the ideal figure given by Professor M'Coy, in his paper already referred to, 

 which is so incorrect as to be calculated to mislead as to the true organization and 

 relations of the animal. The surface of the carapace is covered with very regular 

 granulations of two sizes intermixed, the larger being the more numerous ; towards the 

 dorsal portion they become less prominent, and less regular in form, and are accompanied 

 each by a depressed punctum; the cervical fuiTow is deep and smooth, and extends 

 downwards to within a line of the margin ; the hepatic sulcus is d.-ej), narrow, of 

 somewhat the shape of the Greek X ; the upper limb commencing at about one third from 

 the centre of the back, and continuing nearly straight downwards, the anterior limb 

 stretching forwards, slightly curved, and terminating near the root of the supra-antennal 



