156 



d„ Spine of 4 1 ' 1 abdominal tergum measuring but one- 



fourth that of 3 rd ensifer A. M.-Edw. var. parvispina de Man 



c„ First and second abdominal terga provided with a high, 

 prominent and sharp carina. First tooth of postrostral 

 crest placed a little behind the middle of carapace Sibogae de Man 

 6 2 The 3 ld , 4 th and 5" 1 abdominal terga are produced as spines afjïnis Borr. : ) 



(L. A. BORRADAILE, 1. C. IQI 5, p. 208.) 



Alphonsi Bate 

 (C. Spence Bate, Report Challenger Macrura, 1888, p. 632, PI. CXII, 

 fig. 1.) 



dorsalis Bate 



1. Heterocarpus Wood-masoni Alcock. PI. XIII, Fig. 36 — 36 f. 



Heterocarpus Wood-masoni A. Alcock, Descript. Catal. Indian Deep-Sea Crust., Calcutta 1901, 



p. 108. 

 Illustrations of the Zoology of the Investigator, PI. LI, fig. 2. 



Stat. 5. March 10. 7°4Ó'S., U4°3o'.5E. Madura Strait. 330 m. Bottom mud. 6 females of 



different size, 2 of which are ova-bearing and 1 young specimen. 

 Stat. 12. March 14. 7°i5'S., U5°i5'.6E. Bali Sea. 289 m. Bottom mud and broken shells. 



1 male, 2 females without eggs and 1 young specimen. 

 Stat. 74. June 8. 5°3'.sS., U9°o'E. Off Makassar. 450 m. Bottom Globigerina ooze (obviously 



a thin layer). 2 females, one of which is full-grown and laden with eggs. 

 Stat. 254. Dec. 10. 5°4o' S., I32°2Ó'E. Near the Kei-islands. 310 m. Bottom fine, grey mud. 



1 adult, ova-bearing female. 

 Stat. 256. Dec. 11. 5°2ó'.6S., I32°32'.5 E. Near the Kei-islands. 397 m. Bottom greyish green 



mud. 2 males and 1 1 ova-bearing females, all adult. 



Of this remarkable Heterocarpus, which was founded by Alcock on two young individuals 

 from the Andaman Sea, no less than 27 well-preserved specimens of different size, males, 

 ova-bearing females and young individuals, have been collected by the "Siboga", so that I 

 am able to publish a better and more detailed description. Hetcroc. Wood-masoni is therefore 

 such an interesting and remarkable species, because it differs from all the other known represen- 

 tatives of this genus firstly by the postocular carina wanting completely, while 

 the two other later al carinae of the carapace are developed throughout 

 their whole course and furthermore by the existence of a sharp, curved 

 spine on the anterior half of the 3 rd abdominal tergum. 



The largest male is 131 mm. long from tip of rostrum to end of telson, the largest 

 ova-bearing female 149 mm. In the adult species the carapace appears much higher in 

 proportion to its length than in young individuals, one of which was figured on Plate LI of 

 the "Illustrations of the Zoology of the Investigator". In the youngest specimen from Stat. 5 

 the carapace is 8,25 mm. long and 4 mm. high in the middle, twice as long as high; in the 

 males from Stat. 256 these numbers are respectively 27 mm. and 16 mm., in the full-grown 



1) This species is described as differing from Hettroc. AlpfconsiHate by (i) the rostrum being much more strongly upcurved, (2) by 

 the joints of the carpus of the 2 nd legs being less in number, (3) by the walking-legs being considerably longer than the antennal scale. 



