ADDENDA TO MARSIPOBRANCHII, ELASMOBRANCHII, ETC. 59 



"18 (b). S. vesitrioswill Gamiaii. — 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 moutli. 

 Month very broad, little arched, Avith only a trace of labial fold. Teeth 

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

 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 Tetrodontldw, till its diam- 

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

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

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

 pots. 



''(Gannau, Bull. Mus. Comp. Zool. vi, 1G7: 1880, ? ? Scyllium latkeps Aug. Dum6ril, 

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

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



Page 19, in key, after "«", add: 



" y. Enibrj'o not attached to tlie uterus by a placenta; teeth all obtuse, without basal 



cusps MUSTELUS, 14. 



'*2/2/. Embryo attached to the uterus by a placenta; some of the teeth pointed, each 

 with one or two basal cusps Rhinotriacis, 14 (&)." 



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 "j/" add : 



'^fff. Teeth in uxixier jaw serrate at base, in lower jaw entire Hypopriox, 19 (&)." 



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

 tical with Mustelus Mnnulus, and add : 



"14 (J).— KIIINOTRIACIS Gill. 

 " (Pleuraa-omylon Gill, 1864.) 

 " (Gill, Proc. Ac. Nat. Sci. Phila. 1862, 488 : typo Bliinotriacis henlci 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. 

 {yr^, snout ; rptia/.tq, Triacis.) 

 " 20.— R. hciiici Gill." 



(See text, "22. T. henleV) coast of California; not uncommon.) 



