184 HULLETIN Of THK HUREAU OF FISHERIES. 



is convex and the tcrgul stnughl. The plule lias a dense and ininnle senlplnre el' line radial lines 

 which are irregular or divaricating, and a coarse siulpiure of well-spaced wrinkles and furrows, paralh-1 

 to the growing margins of the valve. The furrows and rililets are more emphatic in the baso-carinal 

 area of llie seuluni. Iieing crowded there into a strong corrugation. Inside there is a single massive 

 tooth, bifid at its summit, under the umbo in each valve. 



The terguni is wedge-.shaped, closelj' corrtigated parallel to its scutal liorder. but willi two rounded, 

 conti.suous ribs running along the opposite or outer border. The apical angle is less than !t()°. Inside 

 smooth, with a miiuite tooth at the -icutal margin of each tergum near the occludent end. 



The carina i.- nairow di^lally. but from the middle down it widens rapidly, the sides becoming iniu-h 

 liroader and ai the .-iame lime flaring laterally. They are corrugated parallel with the scutal margin. 

 Thereof of the carina is very narrow throughout, widening gradually and slightly upward and with a 

 median hollow or furrow. Inside there is a massive transverse septum at the lower two-lifthsof the 

 carina, rising in a blunt ariiculating tootli ai each side. 



The pedvincde is \ cry short, cylindric. circularly wrinkled, covered wilh ^i lough Hi'sh-colored 

 integument. 



Capituluiu. total length 14.5, lireadth (i.4, diameter '.) mm. Scutum, length 11.7, breadth 5.7 mm. 

 Tergum, length (i.2, breadth 2.2 mm. Carina, length 10, breadth 2. cliameter 2 mm. Length of 

 peduncle 2 mm. 



Allialross slalicrn 4117. norihwot coast of dahu. 241 to 282 fathoms, bottom of coral .--and and 

 fi>ranunifera. in co]iious numlKMs on large spines of a sea urchin. Also station 4117, 251? to 282 fath- 

 oms, in nearly ihe same place. South coast of Oahu. 315 fathoms, fine whit<' sand and mud. Station 

 8998, vicimty ni Kauai. 228 to 2:i5 fathoms. Stations 4090, 4097, 3883, and 38(i(i, Pailolo channel, 

 between Maui and Molokai, 277 to 304 fathoms, bottom of fine gray sand and globigerina ooze. Station 

 3839, south coast of Molokai in 259 to 2(i(i fathoms. 



In ihe straightening out of the liasal margin to liring it parallel to the occludent edg(>, /'. btlliim is 

 like MKiaUisDia .il rial tun Iloek. The system of s<-uli)ture, the viTV short peduncle, the internal ridge 

 acniss the c;ivity of the carina, and the silu^ on sea-urchin spines are also features approximating Mcija- 

 liLsiiiii; l)Ul thai genus diifers liy the slightly higher position of the umbo of ihe scunim. ou the occludent 

 margin, and the much broader c res! of the carina. ( >n ihe whole, /'. hi Hum may lie said to .^land inter- 

 medial<' belween I'liciliixnia carinatiiiii and Mnialri.iiiia. Fanlasiiui 6c,'/um is an abundant species on line 

 ssnd 1h.ii.iiii> ihroughont Ihe Hawaiian group, always seated on large Erhinitu .'opines, frequently sharing 

 llieiu witli Ah piis_ It is a hauilsonie little barnacle, very constant in :dl its feattires. 



Dichelaspis ha'waiensis n. sp. 



[I'l.iv. lig. .-,.| 



Tlie ca])ituluiu is much t-ompressed, unsymmetrually long oval<', supported on a nude peduncle 

 half the lenglh of the capitnluin or shorter. The valves are in contact only at their ends. The general 

 inlegument is smoolli. 



The scutum is L-shujied. ihe basal segment narrower I ban ihe occludent , the lal I I'r widening above 

 to its ol)li(pu' lerminalion. and alioul twice the length of the l)asal segment. The tergum is irregularly 

 triangular, with blunt apex, slighlly concave and very long carinal margin, and with a notch near the 

 occludent em! of ihe sculal margin for the reci-ption r)f ilie distal end of the scutum. .Vn arcuale f\uTow 

 runs upwuril from ibis noich. Thc' carina is arcuale and extends upward well beyond the middle of the 

 tergum. Il is widest in ihe middl'-. and ai ihe liase is expanile.l in a biramose appendage clasping the 

 lop of the peduncle, which il half I'ni'irch's. Thi' peduncle is stout, cylindrical, and circularly wrinkled. 



Length of capittilum, (i.5 mm., breadlh :'i.2 nun. 



Type, no. 32409, U. S. National Museum, from Hawaiian Islands, i-ollected by tli<- Mbatniss. 1902, 

 allached lo a slender .gorgonian. 



This species is mori' closely related to /*. oithoijonin E)arwiii than (o any <'ther. Il tlil'fers fnuu thai 

 in Ihe shorter lia.^al porlii'U of the senium, the sim])l<'r shape of ihe lerguin. and Ihe more broadly clasji- 

 ing basal appendages of the carina, rnfortunalely the slalion number was not preserved, so that ihe 

 exact location can not be given. 



