Miscellaneous. 881 



caudal rays (-90) ; the height of the ventrals is less ("IS). 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 ("ll); its greatest width (•08) 

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

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

 of the interorbital area ('Oo), The snout projects far beyond the 

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

 margin of the orbit. The maxiUary 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 raj- (•00) is half that of the second {'12), 

 which nearly equals the length of the base ('ll). 



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 the dorsal. 



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

 outer rays (-20). The length of the pectorals (•!!) 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 (•OS). 



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 t}-]ies of these descriptions are preserved in the United- 

 States' National Museum in Washington and the University Museum 

 in Jliddlctown, Conn. — SUliman^s American Journal, August 1874. 



On the Emhryogeny of the Rhizocej)haJa . By M. A. Giard. 



In a former communication (' Comptes Eendus,'tome Ixxvii. p. 945) 

 I submitted to the Academy the principal resxilts of my researches 

 upon the Cirripedia Ehizocephala ; and I have since been able to 

 continue the investigation of those curious parasites, and to verify 

 on other species the exactitude of my first observations. Poqiirus 

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

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

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

 evidently P. paguri of authors. Singularly enough this parasite is 

 entirely wanting on the shores of KoscofF and Saint-Pol-de-Leon, 

 where Pagurus bernhardus is nevertheless exceedingly common. 

 The Peltogaster of Eoscoif, which I had named Peltogaster jxiguri, 

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



Jbin. d' Mag. N. Hist. Ser. 4. Vol. xiv. 27 



