1898.] FKOM THE SOUTH PACIFIC. 35 



(iii.) The upper edge of the median crest of the telson is 



almost straight, and is produced posteriorly into a spine, 

 (iv.) The animal is more robust. 



The specimens described by Pocock were taken in the same 

 locality (Arafura Sea) with examples of typical G. cliiragra, and this 

 is the case also with Mr. Gardiner's and Dr. Willey's specimens. 

 Siuce they are connected by a series of intermediates with the 

 type, they must be regarded as a variety only. There is, however, 

 cue character — not mentioned by Pocock, but present, as I have 

 seen, in his type specimen — that comes near to being diagnostic of 

 this form. This character is the presence, on each side of each of 

 the first five abdominal tergites, of a small, sharply-defined, dark 

 spot. Only one of the specimens is without these spots, and, as 

 this is very small and has the appearance of having been consider- 

 ably bleached by the alcohol, it is ])ossible that it does not really 

 form an exception. Ou the other band, I have only met them on 

 one G. cTiircujra not agreeing with Pocock's description of G. smithii. 



All the examples of G. smitJdi are small (10-45 mm. long), as were 

 those of Pocock, but certain specimens somewhat approaching them 

 are considerably larger. There are several undoubted examples of 

 G. chirugra of about the same size as G. smithii. 



Two examples of G. chiragra from the Bahamas now in the 

 Cambridge University Museum of Zoology diiier from the type as 

 found in the Pacific only in the presence of a minute ridge on the 

 median side of the cariuae of the intermediate spines of the telson. 

 Several specimens in the British Museum, from various "West 

 Indian and South American localities, present this feature and have 

 been labelled Gonodactylus oerstedi (Plate V. fig. 3) by Dr. IT. J. 

 Hansen, who has since instituted the species by a brief description 

 in a footnote to p. 65 of the ' Isopoden, Cumaceen u. Stomatopoden 

 der Plankton-Expedition.' I am permitted by the courtesy of 

 Dr. S. P. Harmer to figure the telson of one of the Cambridge 

 specimens of this form. 



The present collections include : — 



8 cJ and 8 $ from Eotuma ; 1 J and o 2 from Funafuti ; 

 2 (^ and 5 $ from Lif u, Loyalty Islands ; 1 d and 1 $ from 

 the Isle of Pines ; 1 c? and 1 $ from Talili Bay ; 1 $ from Ealu ; 

 1 c?) locality not stated. 



There are besides the following specimens of var. smithii : — 



1 (5 and 2 $ from Eotuma ; 1 d and 2 2 from Lifu, Loyalty 

 Islands. 



4. GoNODACTiLvs ESPiNOSUS, sp. n. (Plate V. figs. 5, 5 a, b.) 



Definition. — " A Gonodactylus with cylindrical eyes ; blunt, 

 rounded antero-lateral angles of the rostrum ; elongated carapace 

 with rounded antero-lateral and almost rectangular postero-lateral 

 angles ; lateral margins of first exposed thoracic segment not pro- 

 duced, of second produced and square, of third produced and 

 truncate, of fourth produced and subacute ; lateral margins of first 

 to fifth abdominal segments with small carinse, but not produced 

 into a spine; sixth abdominal segment with four rounded dorsal 



3* 



