■ 1 



8 4 



long, with the proximal third directed outwards, then bending somewhat suddenly forvvards, 

 distally flattened with the outer margin straight, the inner convex, crenulated, and the end acute 

 but not acuminated. Median lobe (lm.) very long, considerably overreaching the setiferous lobe, 

 distally narrower with the terminal part lamellar and rounded ; the lateral process (p*.) moderately 

 long, slender, considerably curved, distally blunt and situated much beyond the midclle of the 

 inner margin of the lobe; the additional process (p'\) small, somewhat slender, strongly curved, 

 far from reaching the end of the lobe. The setiferous lobe (Is.) long, narrow, with not fully 

 two-thirds of the outer margin furnished with seta^; auxiliary lobe (lu.) of very moderate size. — 

 The direction and shape of the terminal process and the shape of the proximal process are 

 extremely characteristic of this species. 



Remarks. — The long list of localities shows that this species is very common in the 

 Indian Archipelago, but the large majority of specimens are either very young or larvse, some 

 few are about half-grown and only two are really adult. The list shows besides that the species 

 propogates all the year round. 



Distribution. According to the literature and my material from various sources 



this fine species is widely distributed in the warmer area of the Atlantic, the Indian Ocean 

 and the Pacific. In vain I have looked for differences in the structure of the copulatory organs 

 in specimens from these Oceans. 



3. TJiysanopoda (vqttalis H. J. H. PI. XII, figs. 4a — \c\ PI. XIII, fig. ia. 



1905. Thysanopoda cequalis H. J. Hansen, Buil. Mus. Océan. Monaco, N° 42, p. 19. 



Stat. 118. July 13. Lat. i°38'N., long. I24°28'.2E. HENSEN vertical net, from 900 m. to 

 surface. 1 small adult male and 1 very young specimen. 



Stat. 128. July 22. Lat. 4° 27' N., long. I25°25'.7E. 1645 m - HENSEN vertical net, from /oom. 

 to surface. 1 immature specimen. 



Stat. 148. August 10. Lat. o°i7'.6S., long. I29°I4'.SE. 1855 m. HENSEN vertical net, from 

 1000 m. to surface. 1 adult male. 



As I have given a description of the essential features of this species in the paper 

 quoted, it may be sufficiënt here to refer to my drawings of the anterior part of the animal 

 from above (PI. XII, fig. 4*7) and from the side (PI. XIII, fig. ia), and to add a description 

 with figures of the copulatory organs. The left organs of both males have been examined, the 

 male from Stat. 148, measuring 17 mm., is about middle-sized, while the male from Stat. 118 

 is extremely small, measuring only 13.5 mm.; the organs of these two specimens show some 

 unimportant differences in the shape of the distal part of the processes on the inner lobe, while 

 the differences shovvn by the figures between the processes of the median lobe are due to the 

 casual direction of these processes, as in fig. 4.6 they are seen from the side, in fig. 4c less or 

 more completely from their back. — The main plate is somewhat long in proportion to the 

 lobes. The inner lobe without spine-shaped process; the terminal process is somewhat 

 long, almost gradually tapering, acute and somewhat sinuate, being rather feebly bent two times 

 in opposite directions; the proximal process is longer than the terminal, but yet not reaching 

 its end, with nearly the basal third strong, then much bent and considerably tapering, somewhat 



