No. 11. — iVew Plagiostomia. By Samuel Garman. 



The following are preliminaries of descriptions to be published with 

 more details and with illustrations as soon as the necessary drawings are 

 printed. All except two of the types described are from the collection 

 of Alan Owston, Esq., taken at considerable depths off the Japanese 

 coasts. Excepting one, of the Platosomia, all are Antacea. It may be 

 added here that the name of this section of the Plagiostomia was formed 

 by Rafinesque, 1815, from the Gi'eek "kvra (Latin ante), "before, in 

 front," and 'AktJ or 'Aki's (Latin acies), " a point," for a group comprised 

 of sharks only ; it contained no sturgeons, and the name was not, as has 

 been asserted, made from " dvraKatos, sturgeon." 



Hemigaleus pectoralis, sp. nov. 



Outlines similar to those of the other species of this genus, strongly resembling 

 those of Mustelus canis Mitch. Spiracle larger than the pores. Length of the pre- 

 oral portion of the head greater than the width of the mouth. A moderate labial 

 fold on each jaw. Teeth |^ ; upper oblique, wide, compressed, with coarse serrations 

 in the notch on the outer side ; lower with narrower and more erect cusps, becom- 

 ing oblique toward the angles of the mouth ; three series of smaller erect teeth at 

 the symphysis, both above and below. Intestinal valve with a few transverse 

 turns behind the longitudinal roll. 



Grayish brown on the upper surfaces, olive in life, whitish below ; fins dark, 

 lighter on hind margins. 



No. 847, Mas. Comp. Zool., from the "Aquarial Gardens," for which the 

 collections were made off the coasts of Massachusetts and Rhode Island. 



Parraaturus, gen. nov. 

 Differences in dentition, squamation, and in features of the head and 

 tail, as compared with species of Catulus and Pristiurus, suggest the ad- 

 visability of establishing a new genus, Parmatui'us, to include the 

 species immediately following, and also Pristiurus eastmanni J. & S., 

 1904, from off Izu, Japan, and Catulus xaniurus Gilb., 1891, off Lower 

 California. Parmaturus is intermediate between Pristiurus and Catulus: 



