338 Mr. A. J. Jukes- Biowiie on 



XXXV^II. — Descripiion of a new Cf/prinodont Fish of the 

 Genus Mollieiii6ia//-o;/i Yucutwi. J3y 0. Tate Rkgan, M.A. 



(Published by periuission of the Trustees of the British Mu?eimi.) 



Mollienisia velifera, sp. n. 



Depth of body 2^ to 3 in the len<i,th, length of head 3^ to 

 3i. Diameter of eye 3^ in the length of head, interoibital 

 width 2. 27 scales in a longitudinal series. Dorsal 18-19 ; 

 base a little longer than distance from end of snout ( ? ) "or 

 1| to twice that distance ( c? ) ; longest rays f (?) or 1§ 

 to 2 ( (^ ) as long as head. Anal 10. Pectoral as long a^ 

 iiead ; pelvics reaching origin of anal (?) or with the second 

 ray produced and as long as the intromittent organ (fj). 

 Caudal rounded (?) or with tlie lower angle somewhat 

 produced (c?). Least deptli of caudal peduncle a little less 

 than length of head. Olivaceous ; 3 or 4 dark bars almost 

 covered by the pectoral fins ; back and sides with dark brown 

 longitudinal stripes, broader ones along and narrower ones 

 between the series of scales ; series of pearl-like white spots 

 between the stripes, 2 spots on each scale; these markings 

 much more conspicuous in the male. Dorsal fin dark, with 

 niunerous pale spots ; in males a series of more or less 

 distinct large dark spots in the distal j)art of the fin ; caudal 

 nearly immaculate (?) or the upper g with dark and pale 

 spots and the lower ^ plain, black-edged (c?). 



Progreso, Yucatan. 



Two males (80 and 105 mm.) an 1 a female (92 mm.) 

 presented to the British Museum by Herr J. Paul Arnold. 



This beautiful new fish is related to M.petenensis, but differs 

 in the larger head, fewer scales, coloration, tfec, but especially 

 in the larger dorsal fin, which has more rays than in any 

 other species of the genus, M. petenenais and M. ladjyinwi, 

 which come next to it, having 11 to 1(5. 



XXXVTTl. — Note on Clcmontia subdiaphana, Carp. 

 Hy A. J. Jukks-Bkowxk, F.R.S , F.Ci.S. 



I DKsiKK to make a correction respecting the shell which 

 was described as a new species of Clemenl'ia in this magazine 

 for July 1913. Dr. Dall, of the U.S. National Museum, 

 has since identified it as the adult form of the shell which 

 was described hy I'h. ('ari)cntcr in 18GJ under the name of 

 ( 'hnncntid subil'i<tp}iinm. 



