ï6 



I imens in all were taken; some of them were attached to cylindrical sterns of 



ralline organism most probably. The length of the capitulum of the largest pecimen taken 



that "i its peduncle is about 1,6 mm. A young specimen is 

 near it nity. 



rhe •Siboga" i . »< .k these specimens at three different Stations: 



Lat. 3 -,~ S., Long. u; 56 E. Depth 59 m. Bottom: fine 

 ind. 1 specimen, 

 me 13, 1 Borneo Bank. Depth 50 — 40 m. Bottom: fine coral-sand. 1 specimen. 



.. Januai [900. Lat. 9 0.3S., Long. 126 24'. 5 1 . Depth [12 m. Bottom: mud, 



nd and sliclls. 3 specimens. 



1 ormae dubiae. Though 1 have long heen in doubt on the matter, 1 consider a 



two large, two smaller and a few very small specimens) as belonging also to 



this sj which were collected bj IL M.S. "Siboga" at Station 318 at a depth of 88 m., 



two small specimens taken at Station 294. Their shape is slightly different, being much 

 flatter and the peduncle is shorter. The largest specimen has a capitulum over 7 mm. long 

 and may be considered a full-grown specimen as it is furnished with well-developed egg-sacks. 

 This anima! is figured on PI. II, tig. 18. In this specimen the proportion ut' the two segments 

 of the scutum is different from what it is in the individual represented in tig. 14 of the same 

 plate. Other ditïerences are shown by the figures anti are perhaps not important enough tor 

 minute description. Of one of the specimens of Station 318 I have prepared the valves and 

 made with their aid the drawing tig. 1, PI. III. I have made a drawing further of the smallest 

 specimen of all (PI. III. tig. 1 A), taken also at Station 318 and of one of the slightly larger 

 "in-s (PI. III. tig. 1 II cf Station 294. In that of Station 318 the shape of the shells is still 

 (piite different from that in the full-grown and those of Station 294, having a capitulum of 

 t,8 mm. in length, may be considered as forming the transition between the very small one 

 with a capitulum of 1,25 mm. and the full-grown form. 



The position of the stations where these forms were taken was as follows: • 



14. January 23, 1000. Lat. to°i2'.2S., Long. 1 24 : 27 .3 I-".. Depth 73 m. Bottom: soft 

 mud with very fine sand. Two small specimens. 

 St.it. 318. Fcbiu.it v 22, 1900. Lat. 6°3o.5S., Long. [I4°55'.5E. Depth 88 m. Bottom: fine 

 yellowish grey mud. Several large and smaller specimens. 



4. Dichelaspis Weberi n. sp. PI. III, tig. 2 — 7. 



Capitulum much compressed with the apex slightly produced. Scuta with the basal segment 

 .ver than the occludent segment and not quite half as long. Terga with three unequal 

 ma projections on the scutal margin of the valve. Carina much bowed, internally very 



rminating downwards in a small spatula-like disc. 



ral appearance. Capitulum compressed, flat. Valves relatively small, narrow, a 

 tween the carina and the other valves. Valves covered by a thin transparent 

 ily Peduncle cylindrical, much shorter than the capitulum (PI. III, tig. 2). 



26 



