402 C. R. Eastman — New Elaamobranchs from Solenhofen. 



terior dorsal and, except for being more sharply pointed, resem- 

 bles it in form and proportions. The pelvic pair is decidedly 

 acuminate, and placed midway between the anal and pectoral 

 pair. The pelvics slightly exceed the second dorsal in size, 

 which latter is somewhat higher and longer than the first dor- 

 sal ; and the depth of the pectorals is about one-third greater 

 than that of the pelvic pair. Nearly the entire front margin 

 of the right pectoral fin is preserved, but the distal portion of 

 the left pectoral is either concealed or broken away. The same 

 is true of the terminal part of both lobes of the caudal. The 

 general outline of body and position of all the fins is shown 

 in the accompanying illustration (Plate I). In this the shaded 

 area immediately behind the head indicates a piece broken 

 away from the containing rock. 



The specific name is bestowed in honor of the memory of 

 the late and deeply lamented Geheimrath Karl von Zittel, of 

 Munich. 



Genus Phorcynus Thiolliere. 

 Phorcynus catulinus Thiolliere. (Plate II.) 



Our knowledge of this species has depended hitherto solely 

 upon the type specimen, which lacks the anal and is in other 

 respects incomplete. It must be regarded, therefore, as an 

 extremely fortunate occurrence that a second and more perfect 

 example of this forerunner of modern Dogfishes should have 

 been discovered a half-century after the first was found, and 

 should provide the means of further enlightenment concerning 

 this genus and species. 



The total length of the Carnegie Museum specimen, which 

 bears the catalogue number 4780, is a trifle less than 40 cm . 



It is a little difficult to determine the exact length of the 

 head, but it was apparently contained between five and six times 

 in the total length. The outline of the cranial roof, including 

 the orbits on either side, and that of the lower jaw, is clearly 

 shown. In the ethmoidal region and elsewhere in the body, 

 the rounded or polygonal tesserae of the endoskeletal cartilage 

 are beautifully displayed, and the same remark applies to the 

 fine shagreen granules occurring throughout the integument. 

 Just beneath the orbital cavity are to be seen impressions of a 

 few minute teeth, each provided with one principal and a pair 

 of lateral cusps. 



The vertebral column is preserved intact almost to the 

 extremity of the tail, being flexed upward to support the upper 

 caudal lobe. Ninety-six vertebral centra are to be counted in 

 continuous series, and it is probable that not more than five or 

 six are missing from the posterior extremity. The centra are 



