LORICULA. 85 



fellow valve on the opposite side, inasmuch as two small peduncular scales were inserted 

 between the ends of the larger peduncular scales, which of themselves projected beyond 

 the edges of the second latera : to fill up this hiatus, I conceive there must have once 

 existed a carina. For the same reason, I believe, but less strongly, that there also 

 existed a rostrum. It may be observed that in the present condition of the specimen, 

 the straight lines of intersection between the two outer large peduncular scales and the 

 small rostral and carinal scales, do not correspond with junctions of any valves in the 

 capitulum ; but if, as in our imaginary figure (4), a carina and rostrum be added, 

 the above two lines of intersection will correspond with junctions of valves in the capi- 

 tulum; making altogether, on each side, in the capitulum four lines of junction, and in 

 the peduncle four lines of intersection. 



At present there is a wedge-formed open space between the first and second latera; 

 and judging from the lifted up position (fig. 1) of the upper scales of the peduncle under 

 the second latus, this interspace must originally have been a little larger. In order to com- 

 plete the sack to receive and protect the animal's body, this interspace must have been 

 closed either by a valve or by a membrane j — the latter supposition seems to me very 

 improbable, considering the closely loricated condition of the whole exterior ; consequently, 

 I believe that on each side, a triangular valve with its apex downwards was wedged in 

 between the two latera, and that these valves answered to the terga of other Cirripedes. 

 On any other view, considering the high improbability of the entire abortion of the terga, 

 we must conclude that either the first or second latus was a tergum, though of a totally 

 difi'erent shape from that valve in every other pedunculated Cirripedc ; the other latus, 

 moreover, would on such a view be a complete anomaly. 



In the imaginary restored figure (fig. 4), the tergura has its normal shape and manner 

 of growth. The fii-st latus now answers to the upper latus in Scalpellum, but it is inter- 

 posed to a quite unprecedented extent between the scutum and tergum. The second latus 

 is on this view the carinal latus ; and the rostral latus, always smaller than tlie carinal 

 latus, and in iS. quadratum and Peronii reduced to a very small size, is here quite aborted. 

 A restoration, however, of this nature must always be very doubtful. Finally, I imagine 

 that the Loricula was attached by the side of the lower part of its peduncle to some large 

 shell or coral, and that a crab or some other animal tore ofi" the upper side, and this subse- 

 quently being dropped, became embedded in the chalk ; the corresponding valves with the 

 addition of a carina, rostrum, and a pair of terga being left adhering to the surface of 

 attachment. 



Affiiiiiles. — In an animal so imperfectly known, it is useless to enter on this subject : 

 I will only remark that the restored figure comes nearest to the genus Scalpellum ; the 

 recent 8. ornatum has the scales on the peduncle even proportionally more elongated than 

 in Loricula, The chief distinctive character of the genus, as at present imperfectly known, 

 lies in the arrangement of the scales on the peduncle. In those species of Pollicipes, Scal- 

 pellum, and Lithotrya, in which the scales on the peduncle are symmetrically arranged, 



