THE BARNACLES IN THE U. S. NATIONAL MUSEUM. 89 



The largest specimen measures, length 12.7, width 5.5, diameter 

 3.3 mm. 



The mandibles and cirri resemble those of P. 'kxmpferi^ but the 

 maxilla (Plate V, fig. 16) has weaker spines at the upper angle, and 

 its edge is much less deeply notched below them. 



This form stands very near M. gracile Hoek, which is possibly from 

 a mid- Atlantic station; but in J/! gracile the lower area of the scutum 

 is smaller, the tergum longer, and the carina more curved than in 

 M. g. gracllii(s. The peduncle, too, is longer, one-third the length of 

 the capitulum in Hoek's species, while in the series of seven M. g. 

 grac'dlus it is extremely short. 



Pmcilasma gracile Hoek was described from the ChaUenger station 

 " 164A, off Sydney, New South Wales, in 410 fathoms." Station 161B 

 has been given for the localit}^ of a series of mollusks in part of dis- 

 tinctly Atlantic relations.'^' 



That they reallj^^ame from the Australian station was doubted hj 

 the present writer.* Finally Mr. Charles Hedley ''advanced the theory 

 that 161B might be an error for 64, a station in the mid-Atlantic 

 between Bermuda and the Azores, where, in 2,700 fathoms, "about a 

 cwt. of ooze'" was secured. The Australian Stations 164 and 164A 

 were mereW sounding stations, '^ the former in 1)50, the latter in 1,200 

 fathoms. No specimens other than "green mud" were reported as 

 taken in the account of these soundings. From the alleged depth, 

 410 fathoms, it is obvious that the adjacent station, 164B, is the one 

 intended by Hoek. The facts in the case^ so far as known, favor Mr. 

 Hedle3"'s supposition that there was an error in reading the label and 

 a mixture of material from two stations. It is possible, therefore, 

 that Pcedlasm.a gracile is an Atlantic and not an Australian species. 



MEGALASMA ANNANDALEI, new species. 

 Plate V, fig. 14. Plate VII, figs. 15-19. 



Type.—Q2,t. No. 32901, U.S.N.M. 



Type-locality. — Albafross Station 2731, off Cape Hatteras, on Scal- 

 pellu?n velutinnra^ in 781 fathoms. 



The capitulum is twice as long as wide, compressed in its upper half, 

 the lower half very plump. The occludent margin is moderateh' con- 

 vex, the carinal margin strongly so. The plates are strong, white, 

 and sculptured with very fine and faint radial strife and rather widely 

 spaced strong concentric grooves, with ver}' fine intervening growth- 

 striae on the scuta, more crowded grooves on the terga. The pedun- 

 cular orifice is nearly circular. 



a See E. A. Smith, Proc. Malac. Soc. London, I, pp. 59, 60. 

 ''Man-ial of Conchology, XVII, p. 122. 



«Proc. Linn. Soc. N. S. Wales, 1901, p. 22; cf. also Rec. Australian Museiiin VI. 

 p. 212. 



''^Challenger Reports, Summary of Results, Pt. 1, p. 576. 



