144 31R. A. S. WOODWARD OX SQUATIXA CRA^'EI AXD 



13. On some EEiiArtfs o/Sqtjatina Cea^'et, sp. nov., and the Mandiele 

 0/ BEL0X0ST0]5irs ciKCTTJs, from the Chaxe: 0/ Sussex, j:)reser?;€c? 

 in the Collection of Heis'ey "\\^illeit, Esq., P.G.S., Beighton 

 MrsErM. By A. SiiriH Woodwaed, Esq., E.G.S.,r.Z.S., of the 

 British Museum (jS"atural History). (Eead February 8, 1888.) 

 [Plate YII.] 



Last year, when attempting to elucidate the dentition of the Creta- 

 ceous Selachian genus Fti/chodus, I had the honour of bringing before 

 the notice of the Society an important specimen from the cabinet of 

 ELeniy Willett, Esq., E.G.S., of Brighton; and in subsequent studies 

 both of this and of contemporaneous ichthyic types I have been 

 favoured by the same gentleman's kind permission to make use of 

 the whole of his valuable collection. Among the fossils there are 

 two, bearing upon the subject of recent inquiries, which seem to 

 reveal points of considerable interest and significance ; and of these 

 I propose to offer a brief notice in the present communication. The 

 one specimen adds the " Angel-fish " (Squatina) to the list of English 

 Chalk Pishes, and apparently indicates a new species ; the other 

 makes known some hitherto unrecognized features in one of the 

 most singular of Cretaceous Ganoids, Belonostomus ductus. 



I. SorATixA Ceaijei, sp. nov. (PL YII. figs. 1-6.) 



The remains referable to the Selachian genus Squatina consist 

 of a crushed skull, with the mandibular and hyoid arches, and an 

 associated fragment of the pectoral fin, with dermal tubercles. The 

 fossil indicates a small animal, probably not more than thirty inches 

 in length, and the most important of the features it presents are 

 illustrated in figs. 1-6 of the accompanying Plate. 



The skuU has been crushed somewhat obliquely from above 

 downwards, the jaws of the right side being displaced to a position 

 beneath the middle of the cranium, and the right hyomandibular 

 cartilage, thrown outwards, is completely severed from these. The 

 difficulties of interpretation are, moreover, increased by the un- 

 fortunate chance-fracture of the specimen on its discovery. One 

 half of the block of chalk (fig. 1) retains the left hyomandibular 

 (lim) and pterygo-quadrate (pq) cartilages, with a portion of the 

 left mandibular {md) and ceratohyal {ch) viewed from the inner 

 side : in addition to numerous scattered teeth, and the impression 

 of the left half of the cranial roof, to which some of the cartilage 

 adheres. The counterpart block shows the remainder of the left 

 mandibular and ceratohyal cartilages, the complete right hyo- 

 mandibular, and a fragment of the right mandibular ; while there 

 are also undeterminable portions of the cranium itself, besides the 

 associated dermal shagreen already referred to. 



The form and relative proportions of the cranium and its ap- 

 pended arches are very similar to those of the living representative 

 of the genus, so far as they are recognizable. The antorbital pro- 



