ADDENDA TO MARSIPOBRANCHII, ELASMOBRANCHII, ETC. 59 



" 18 (&). S. vcBitriosum Gartuan. Swell Shark. 



"Grayish, tinged below with yellowish. Back with black cross-bars, 

 upper parts with large round black spots; sides also with small whitish 

 spots. Head very broad and depressed, broader than long, and not half 

 as deep as broad. Snout very blunt, projecting little beyond the mouth. 

 Mouth very broad, little arched, with only a trace of labial fold. Teeth 

 similar in both jaws, small, tricuspid, in about four series, ff in number. 

 First dorsal beginning over middle of ventrals ; second dorsal beginning 

 behind front of anal and ending before end of anal. When caught, this 

 shark inflates its stomach with air, like the Tetrodontidce, till its diam- 

 eter is one-third its whole length. It will then float belly upward on 

 the water. L. 2 feet. Monterey to Chili; very abundant in Santa 

 Barbara Channel. A small, voracious shark, often taken in lobster- 

 pots. 



"(Garman, Bull. Mus. Coinp. Zool. vi, 167: 1880, ? ? Set/Ilium laticeps Aug. Dume'ill, 

 Rev. et Mag. Zool. 1853, 84, pi. 3, fig. 2: Cephaloseyllium laticeps Jordan & Gilbert, 

 Proc. U. S. Nat. Mus. 1880, 40.) " 



Page 19, in key, after "a", add: 

 " y. Embryo not attached to the uterus by a placenta; teeth all obtuse, without basal 



CUSpS ...................................................... MUSTELUS, 14. 



ll yy. Embryo attached to the uterus by a placenta ; some of the teeth pointed, each 

 with one or two basal cusps .......................... RHINOTRIACIS, 14 (6)." 



After "/"add: 



"s. First dorsal nearer ventrals. than pectorals ; embryo not attached to the uterus by 

 a placenta .......................... ..................... CARCHARINUS, 18. 



"zz. First dorsal nearer pectorals than ventrals; embryo attached to uterus by a pla- 



centa .................................................... EULAMIA, 18 (b)." 



After "./T' add : 

 "fff. Teeth in upper jaw serrate at base, in lower jaw entire ---- HYPOPRION, 19 (6)." 



Page 20: Erase "20. Mustelus calif ornicus", which is doubtless iden- 

 tical with Mustelus Mnnulus, and add : 



" 14 (&). RHINOTRIACIS Gill. 



" (Pleuracromylon Gill, 1864.) 

 " (Gill, Proc. Ac. Nat. Sci. Phila. 1862, 488 : type Eliinotriads lienlei Gill.) 



" Characters of the genus Mustelus, except that each embryo is at- 

 tached to the uterus by a placenta. The teeth are sharper, some of them 

 being pointed, and with one or more short basal cusps. Warm. seas. 

 (piv, snout ; rps~ta7.is, Triacis.) 

 " 2O. R. lienlei Gill." 



(See text, "22. T. lienlei" - } coast of California; not uncommon.) 



