1904.] FROM EAST AFRICA AND ZANZIBAR. 405 



papilla is very large and connected with the front branchia by a 

 membrane, from which an accessory membrane runs to the 

 accessory branchia. The rhinophores are protected by raised 

 tubes about 4 mm. high and covered with tubercles. The external 

 opening of the mouth is unusually large. On each side of it is a 

 conical well-developed tentacle pointing laterally. 



The internal organs correspond with Bergh's description. There 

 is a moderately large stomach with meinbi-anous walls, almost 

 entirely enclosed in the liver, there being no dilatation whatever 

 in the digestive tract before it enters this organ. Within the 

 liver the cavity of the stomach measures about 6 mm. across, and 

 the intestine when it issues is nearly the same size. 



Genus Miamira. 



This curious form is of very uncei-tain affinities. Its elongate 

 shape and labial armature seem to ally it with Chromodoris. But 

 the teeth are uniform and hamate, without denticulations, the 

 back bears ridges and tubercles arranged in a regular pattern, and 

 the branchiee are tripinnate. A unique character is presented by 

 the lappets on the mantle-edge, with gill-like lamellae on their 

 underside. 



Miamira nobilis B. 



[Bergh, " ISTeue Nacktschnecken," Jour. Mus. Godeffroy, Heft 

 viii. 1875, pp. 53-63.] 



Two specimens fi-om New Britain given me by Dr. Willey. In 

 one (hereafter called the first specimen) the tubercles and lobes 

 are much ampler and more elaborately divided than in the other 

 (or second specimen), so perhaps the two forms correspond to the 

 typical species and variety described by Bergh, But the colour 

 of both is the same — olive-green with a few white spots on the 

 lower parts, and there is no difference to speak of in size. The 

 length is 40 mm., the breadth 14, and the height 18. Down the 

 middle of the back runs a ridge which bears obscure indications 

 of being three ridges fused into one. It is about 6 mm. high in 

 the first specimen, and 2 mm. in the second, and in both bears 

 four tubercles. From the point where these tubercles arise, 

 transverse ridges run at right angles to the side of the body and 

 terminate each in a lateral lobe. The mantle-border is marked 

 by a double ridge. There is a veil-like lobe over the head, which 

 is trifid in both specimens, and another over the tail, which in the 

 second specimen is small and simple, but in the first very large 

 and studded with many accessory tubercles. At the sides of the 

 body are four lobes, three in front of the branchiaj and one behind. 

 The lateral and terminal lobes bear lamellpe on their underside in 

 both specimens, but in neither are there any under the head-lobes. 

 The branchial pocket is at the end of the dorsal ridge, raised and 

 irregularly tuberculate. In the first specimen there is a very 



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