NO. 1 139. / 1 KEP- WA TEE MOLL UtCA VERB ILL A ND B U* ff. 859 



become large, strong, and thick distally, with broad V-shaped bases 

 separated by deep pits. In the posterior series, which is a little the 

 longer, there are eleven teeth corresponding in form and arrangement 

 with those of the anterior series. The exterior surface is regularly 

 sculptured with prominent, sharp, concentric, raised lines separated by 

 wider intervals. Interior very glossy. Muscular scars and pallial 

 line not visible. Exterior sculpture clearly seen through the shell. 



Length, 4.2 inm.; height, 2.8mm. 



One valve, among Foraminifera, station 2150, N. lat. 13 34' 45", \Y. 

 long. 81 20' 10", in 382 fathoms, 18S4. 



ORTHOYOLDIA Verrill and Bush, 1897. 

 a YKHRILL and BUSH, Aruer. .louru. Sci., Ill, pp. 55,62, January, 1897. 



Type. Orthoyoldia xcaphia (Dall). 



Shell oblong, gaping, blunt or rounded at both ends, without a dis- 

 tinct rostrum; no cariua. Pallial sinus large and broad. Teeth 

 numerous in both series. 0. scapina (Dall), from off Brazil and 0. 

 solenoid es (Dall) from the West Indies. 



MEGAYOLDIA Verrill and Bush, 1897. 



Megayoldia YEUKILJ, and BUSH, Amer. Journ. Sci., Ill, pp. 55, 62, fig. 17, January, 

 1897. 



Type. ;~\[e<j(it/<>l<lia thraciceformis (Storer). 



We have established a new generic group for this large and well- 

 known species, which has sometimes been referred to Toldia and some- 

 times to Porilaud'm. .No closely allied species is known. It is proba- 

 bly the largest known species of this family and is remarkable for its 

 broad, short, compressed form, with a very short, blunt, indefinite, pos- 

 tero-dorsal rostrum, and with a low radial ridge, ending in a postero- 

 ventral marginal lobe. The chondrophore is remarkably large and 

 strong, concave, striated within, and projects much within the margin 

 of the hinge-plate. The pallial sinus is large and deep. In outline it 

 somewhat resembles typical Portland i, but differs in being broader, 

 natter, and gaping at both ends, and in having a strongly developed 

 external ligament. From Yoldia it also differs in the last character, as 

 well as in outline, bnt agrees with it in its compressed gaping shell. 



The postero- ventral margin of the mantle forms a pouch-like protru- 

 sion, corresponding to the radial ridge. The siphon tubes are long and 

 united j the posterior pallial tentacle is long and slender. The palpi 

 are very large. The palpal tentacles originate from the body-wall at 

 the base of the outer palpi 5 they are long 'and thick, with a large 

 furrow on one side. 



