290 MR. CVKIL CROSSLAXD OX THE [Feb. IG, 



being of very wide geographical distribution, adapts itself to a 

 vaiied habitat. 



In East Africa the specimens were collected as follows : — 



Two large examples 280 mm. x 10 mm. over all, fi'om the 



interstices of coral, low spring-tide level, Chiimbe Island, 



Zanzibar Channel. 

 Nine, mostly of similar size, from the sand of Chuaka Bay, 



Zanzibar. 

 One, 170 mm. x 4 mm., from muddy sand, lowest tide-level. 



Prison Island, Zanzibar Channel. 

 One, incomplete but apparently originally of the same size, 



dredged from 10 fathoms, Wasin Harbour. 



In the Maldives :-- 



Two of fair size and two smaller, with fi'agments, fi'om the reef 

 at Hulule, Male Atoll. 



Half a dozen small specimens and fi-agments of a lai'ger fi'om 

 breaking up stones on Minikoi reef, six fair-sized fi'om the lagoon 

 sand, one from decaying beach-sandstone, and three dredged from 

 5-7 fathoms in the southern parts of the lagoon of the same 

 atoll. 



Fragments, in some cases doubtfully identified, from Goidu reef, 

 off Mahlos Atoll, in 4 fathoms and 22 fathoms, the latter from 

 among Polytrema and stones ; from 30 fathoms with a rough stony 

 bottom off Suvadiva ; and on Minikoi reef specimens were found 

 in sand under bouldei-s. 



From Funafuti (collected by Gardiner) : — Two specimens, one 

 from the outer reef, the other from the mangrove-swamp. 



From the Seychelles (collected by Dr. E. P. "Wright, of Dublin, 

 in 1868. The specimens were kindly lent to me by Prof. 

 Mcintosh): — Two specimens of good size, 6 mm. and 4 mm. 

 wide. 



The species is thus recorded fi'om almost every part of the 

 Indo- Pacific area, from the Red Sea to the Philippines, and 

 occurs in almost every kind of habitat. 



The examination of this large number leads to some modi- 

 fication of former accounts which Avere based on one or tAvo 

 specimens only. 



The colour of the living animals is somewhat variable, the round 

 or oval white spots and the collar on the fourth setigerous segment 

 (the origin of Grube's name " collaris ") being often absent or but 

 partially and irregularly developed. The two specimens collected 

 together on Chumbe Island difiier in this respect from each other, 

 and form the above arrangement Avhich has hitherto been I'egarded 

 as specific. The ground-colour of both is a light yellow- brown, 

 interrupted in the one case by uniformly scattered minute white 

 dots alone, in the other irregular ti-ansverse blotches of Avhite ai'e 

 added. In neither is there any collai-. The tentacles are banded 

 alternately Avith broAvn and Avhite, and the feet &c. are white. 

 The specimen from Wasin is similar, but the AAdiite blotches are 



