the specimens I have been able to in. in dried condition and did m>t show 



this 



In the specimens of the variet) robusta^ the chitinous membrane is developed very 

 stro; the line separating the capitulum from the peduncle; here it forms a cushion-like 



swelling over the basal portions of the valves of the lower whorl. The very long peduncle 

 markable characteristic of this variety. All the known species of Scalpellum have 

 rather short peduncles, the longest 1 have seen being that of Sc. Darwini mihi, which measures 

 • >t" the length of the capitulum. < 'f the three specimens "l tin- variety robusta^ <>ne is 

 considerably smaller, most probably not full-grown (this specimen is figured PI. VI, fig. 3; its 

 capitulum i- mm. long, its peduncle 2^ mm.); the other two seem t.> In- full-grown: 



the length of the capitulum is .|S min. in the one and 52,5 mm. in the other specimen. 

 the length of the peduncle is 92 mm. in the one and 73 mm. in the other specimen. 



1': and Fisi m R both give figures of this species representing specimens at their 



natural si/e. Pilsbry says in his description that the peduncle is long and his figure represents 

 it about as long as the capitulum, which is already a fair length for a species of Scalpellum ■, 

 Fischer's figure shows the peduncle cut off transversely, only slightly longer than half the 

 length of the capitulum; in his description he says nothing about the length of the peduncle. 

 In the two specimens from Nagasaki I was able to investigate, the dimensions of the capitulum 

 and peduncle are as follows: 



the length of the capitulum is 48 mm. in the one and 44 mm. in the other specimen, 

 the length of the peduncle is 30 mm. in the one and 14 mm. in the other specimen. 



There are moreover in the variety robusta very characteristic and very prominent rings 

 on the surface of the peduncle. The rather large scales are placed in rows which project freely 

 over the surface as so many hoops and are separated from one another by rather deep circular 

 grooves. The specimen of 48 mm. capitulum-length has about 40, the other about 33 such 

 rings on the surface of the capitulum. They are very distinct on the peduncle of the smaller 

 men of the variety robusta also, but their number is there only 14. 



There are in the "Siboga" collection three specimens in all which I consider to belon- 

 to this variety. Thej were caught at three different Stations, viz. 



Stat. 5. March 10, 1899. Lat. 7 4.6 S., Long. 114" 50.5 E. Depth 330 m. Bottom: mud. 



Large specimen, figured PI. VI, tig. 2. 

 Stat. 251. December 8, 1899. Lat. 5°28'.4S., Long. 1 J2 fl 1 » .2 E. Depth 204 m. Bottom: hard 



coral sand. Large specimen attached to a piece of shell, which bears numerous 



tubes of tubicolous Annclids on its surface. 

 Stat. 254. December n Lat. 5 4.0'S., Long. [32 26 E. Depth 510111. Bottom: fine, 



grey mud. Small specimen, figured PI. VI, fig. 3. 



b. Scalpellum Stearnsi, var. gemina. 



variety gemind has imperfectly calcified valves. In the Japan species and in the 



usta the valves with the exception of the marginal portions are perfectly calcified, 



the portion having the shape of the valve itself. In the variety gemina the calcified 



