I 1 2 



from Newport was figured on Plate 24, which seems to differ from S. I. Smith's tcnuipes by 

 the different toothing of the upper margin of the rostrum. The second form, known from the 

 coast of Brazil, is Pies. vniproducta Bate: the western Atlantic proves thus to be inhabited 

 only by 5 or 6 species. Pies. spiniserrata (Bate) is the only form recorded from the coast 

 of South Chili : excepting this species no representatives of this genus are known to occur on 

 the west coast of America. 



The majority of the species, however, are found in the Indopacific. Besicles the variety 

 semilaevis "f the widely distributed Pies. martin (A. M.-Edw.) and the new variety indica ot 

 the west-indian Pies. longipes (A. M.-Edw.), already mentioned above, nine species are at present 

 known to occur in the Indian Archipelago. Pies. brev ir osiris Bate is still only known from 

 between the Philippine Islands and Borneo, Pies. Ortmanni Doft 1 ., first recorded from Japan, 

 was captured by the "Siboga" in the Bali Sea, Pies. Sindoi (Rathb.) was taken in the Sulu 

 Sea anci west of the Kei-islands, Pies. unidens Bate, distinguished from all the other species 

 by the compressed tooth on the midclle of the 3 rd abdominal tergum, is known from the Bali Sea 

 and from near the Kei-islands, near the latter locality occurs also Pies. rostricrescentis (Bate), 

 a rare form of which only one specimen is known ; the four other species, inhabiting the 

 Archipelago, are the new Pies. assimilis, obtained in Madura-bay and other localities in the 

 southern part of Molo-strait, Pies. binoculus (Bate) known from the strait between the islands 

 of Rotti and Timor, from the strait between the islands of Flores and Solor and from the 

 Arafura Sea, Pies. ocellus (Bate), taken near Samboangan, Philippine Islands, but of which it 

 is still doubtful, whether it occurs also in the Andaman Sea and near the Hawaiian Islands and, 

 finally, Pies. bifurca Alcock & Anderson, which has been captured at several localities of the 

 Archipelago. The seas of New Britain and north of New Guinea are inhabited by Pies. longi- 

 rostris (Borr.) and Pies. unidens Bate. Several species have been observed near the Hawaiian 

 Islands, three of them, Pies. brevis (Rathbun), exigua (Rathbun) and spinidorsalis (Rathb.) have 

 not yet been found elsewhere; the rest are Pies. ensis (A. M.-Edw.), mar/ia (A. M.-Edw.), 

 Sindoi (Rathb.) and a form that was referred by Miss Rathbun with some doubt to Pies. 

 ocellus (Bate). Besides Pies. martia (A. M.-Edw.) and Ortmanui Dofl. still a third species is 

 recorded from the seas of Japan, viz. Pies. hypanodon Dofl., a form closely relatecl to Pies. 

 brevis (Rathb.) from Hawaii. Off Cape Natal, South Africa, Pies. longirostris (Borr.) has been 

 taken and in the western Indian Ocean Pies. gracilis Borr., from the seas, finally, around the 

 coasts of India Pies. bifurca Alcock & Anderson, ensis (A. M.-Edw.), martia (A. M.-Edw.) 

 and unidens Bate are known, furthermore Pies. Alcocki A. R. S. Anderson, a form not yet 

 observed elsewhere, and at last a species, that probably must be referred to the Hawaiian 

 Pies. Sindoi Rathb. 



As regards the vertical range it must be remarked that the species of the genus 

 Plesionika usually occur in moderate depths or even in shallow water. The majority of the 

 species, nearly two-thirds of the whole number known, were captured in less than 400 fathoms, 

 while only four are recorded from a greater depth than 700 fathoms. These four species 

 are Pies. martia (A. M.-Edw.), a large series of which was obtained by the "Woy Woy", 

 October 1906, in the Tasman Sea when the trawl was lowered in 800 fathoms, but this species 



