152 PKOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. * 



81. Pomolobus chrysochloris Rafiiicsque. — "Shad." 



One of the most interestiug facts brought to notice by this collection 

 is the occurrence in the Gulf of Mexico of this species, hitherto thought 

 to live only in fresh waters. 



Three individuals, Nos. 21,778, 21,779, 21,780, were received, Decem- 

 ber 9, 1878, from the Pensacola Ice Company, the largest 15^ inches in 

 length. 



82. Harengula pensacolae sp. uov. Goode & Beau. — Alewife. 



The species is by its form most closely associated with Harengula 

 macropkthalma, while in other respects it resembles Harengula cUqyeola 

 and Harengula humeralis. 



The head is very short, its length contained 4 times in the length 

 of the fish without caudal, and nearly 5 times in its extreme length, 

 to line drawn between the tips of tlie caudal lobes. In H. sardina Poey 

 {=H. macroplitlmlma Eanz., fide Giinther), the head is contained 3 J times 

 in body-length; in H. clupeolu Cuv. & Val. (as identified by Poey), a much 

 more elongate species, 3 J to 3f ; in H. callolepis sp. nov., Goode, MS., 

 from the Bermudas, 3i to 3| times. 



The body is high, with i)rojecting belly, the contour resembling that 

 of the Common Shad, Alosa sapidissima, its height at the posterior ex- 

 tremity of the operculum being greater than the distance from the tip 

 of the lower jaw to the posterior extremity of the operculum: in the 

 other species it is less, notably so in H. callolepis.^ in which the height at 

 this point barely equals the distance from the tij) of the lower jaw to 

 the posterior edge of the preoperculum. 



The height of the body is contained in its length (without caudal) 2| 

 to 3 times (in H. sardina 3 times; in H. clupeola 3.J times; in H. callole- 

 pis 3| to 4 times, being equal to the length of the head). 



Scales of the back in front of dorsal with radiating strije and sharj)ly 

 serrated edges, these features being less prominent in the one or two 

 rows on each side next to the dorsal. Other scales smooth, with irregu- 

 lar, but unarmed free margins. When detached they show from three 

 to seven parallel vertical lines, these lines being most numerous posteri- 

 orly ; upon the nuchal scales these are scarcely present, and they are 

 not visible when attached to the skin, as they are in H. sardina (in H. 

 clupeola the striations of the nuchal scales are very evident, though 

 the edges arc not armed, and the lateral scales exhibit vertical ridges, 

 but in smaller number, ranging from one or more anteriorly to three 

 posteriorly ; in H. callolepis the nuchal scales are smooth, unstriated, 

 unarmed; the lateral scales from the anterior part of the body are 

 marked with lines not even approximately parallel, and neither straight 

 nor extending over the whole scale, as in the other : on the scales of 

 the posterior part of the body, the markings are very irregular, some- 

 times showing as many as nine or ten irregular Avaving, approximately 

 parallel, undulating lines, at others with the A-ertical lines coalescing 



