Miscellaneous. 381 



caudal rays ('90) ; the height of the ventrals is less (43). The 

 scales are large, in thirty-eight oblique rows between the head and 

 the caudal. 



The length of the head (*22) is less than one fourth of the total, 

 and is double its height at the pupil ('11) ; its greatest width ( - 08) 

 is about one third of its leugth. The orbit is nearly circular, and 

 its diameter ( # 05) equals the length of the snout ( - 05) and the width 

 of the interorbital area ( - 05). The snout projects far beyond the 

 lower jaw, whose extremity just passes the vertical from the anterior 

 margin of the orbit. The maxillary is dilated above the mandibular 

 joint, rather tapering behind, and extends to the gill-opening. The 

 gill-rakers are fine, setiform, not longer than the eye ("05), about 

 twenty-five on the lower branch of the outer branchial arch. 



The origin of the dorsal fin is in front of the middle of the body 

 (•45 from snout), and directly above the extremities of the ventrals ; 

 the length of the first ray ( - 06) is half that of the second ("12), 

 which nearly equals the length of the base (-11 ). 



The origin of the anal is at the middle of the body (-51 from snout) 

 and below the posterior dorsal rays ; its greatest height ("11) nearly 

 equals that of tbe dorsal. 



The length of the middle caudal rays ('08) is two fifths of the 

 outer rays (*20). The length of the pectorals ("11) equals the length 

 of base of dorsal (•11).. the extremities reaching to the origin of the 

 ventrals. Length of ventrals -09, distance from snout -35= 



Colour : back and sides brownish, belly white ; a broad, clearly 

 defined lateral band of silver as wide as the diameter of the orbit (-05). 



Radial formula :— D. 13-14. A. 23-24. Length 2-68 inches 

 (M. 0-068). 



Common in shoals in Hamilton Harbour, where it is taken for 

 bait in cast-nets. Its enormous mouth has given it the name of 

 " hog-mouth fry." 



The types of these descriptions are preserved in the United- 

 States' National Museum in Washington and the University Museum 

 in Middletown, Conn. — Sillvnans American Journal, August 1874. 



On the Embryogeny of the Rhizoeephala. By M. A. Giard. 



In a former communication (' Comptes Rendus/tome lxxvii. p. 945) 

 I submitted to the Academy the principal results of my researches 

 upon the Cirripedia Rhizoeephala ; and I have since been aide to 

 continue the investigation of those curious parasites, and to verify 

 on other species the exactitude of my first observations. Pagurus 

 bernhardus is common at Wimereux, where it inhabits by prefer- 

 ence the shells of Buccina, Naticce, and Purpura'. About a third 

 of the Paguri collected in this locality bear a large Peltogaster, 

 evidently P. pa gun of authors. Singularly enough this parasite is 

 entirely wanting on the shores of Roscoff and Saint-Pol-de-Le'on, 

 where Pagurus bernhardus is nevertheless exceedingly common. 

 The Peltogaster of Roscoff, which I had named Peltogaster pagan, 

 from the old very imperfect descriptions, is quite new, and may 



Ann. <Sc May. N. Hist. Ser. 4. Vol. xiv. 27 



