MYSIDACEA— TATTERSALL. 289 



Process on the outer distal corner of the basal jomt of the antennular peduncle 

 shorter than the outer margin of the second joint. 



Eyestalks minutely hispid, eyes not broader than the stalks, of moderate size, 

 pigment light brown. 



Antennal scale much shorter than the antennular peduncle and equal in length 

 ,to its own peduncle, three times as long as broad, both margins convex. 



Sixth abdominal somite almost one and a half times as long as the fifth. 



Telson one and a half times as long as the sixth abdominal somite, two and a 

 half times as long as broad at the base, apex cleft about one-third the length of the 

 telson ; cleft having each lateral margin armed with twenty-seven closely set spines ; 

 apical lobes bluntly pointed and bearing one stout spine ; distal two-thirds of the 

 lateral margins of the telson furnished with about twenty-eight short, regularly 

 arranged spm.es, increasing slightly in length on the more distal portions of the margms. 



Inner uropod equal in length to the telson, inner margins furnished with a row 

 of spines about twenty-seven in number, extending from the statocyst to the apex. 



The type specunen is a female with two pairs of incubatory lamellae fully 

 developed, and measures 17 mm. 



Remarks. — This species is most closely allied to M. crassa, Hansen, 1913, but 

 differs from it in its larger size, much shorter antennal scale and in the larger telson 

 more deeply cleft, and armed with many more spines both in the cleft and on the 

 lateral margins. It cannot be confused with any other species. 



Genus TENAGOMYSIS, G. M. Thomson, 1900. 

 = Theganomysis, Zimmer, 1918. 



This genus for many years remained known only by the type species T. novae- 

 zealandiae, Thomson. In 1918 I described a second species, T. tenuipes, taken by the 

 Australian Antarctic Expedition at Carnelly Harbour, Auckland Islands. In the same 

 year Zimmer recorded the genus iinder the misspelling Theganomysis. from the Bay 

 of Plenty, but the specimens were so defective that a detailed description was impossible. 

 No other species has been described and, in fact, the only records of the type species 

 subsequeiit to Thomson's original record are some by Chilton (1906), from L. Waikare 

 in the North Island. 



The collections made by the " Terra Nova " are rich in specimens of this genus. 

 I find six species in the material, all new to science. In addition, I am allowed, by the 

 kindness of Professor Chilton, to include a description of another new species collected 

 by him. With the two species already described, the genus will now include nine 

 species. I was not able to identify any of the " Terra Nova " species with the type 

 and, as in the light of my examination of this material, it became evident that Thomson's 

 description was not adequate to identify the type species, I wrote to Mr. Thomson 

 and to Professor Chilton asking for specimens. Mr. Thomson, through Professor "W. B. 

 Benham, very kindly sent me the types of T. novae-zealancUae and other specimens 



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