CHROMODORIDS FKOM THE RED SEA, 1071 



" Full length, from edge of mantle in front to tip of foot behind 

 82 mm., breadth across mantle 40 mm, ; these being measured 

 when the mollusc is crawling. Turned over on its back, the body 

 is only 20 mm, wide, mantle remaining much as before ; its margin 

 is not only thus ample, but also mobile. It has no permanent 

 undulations. 



•' Eight gills, simply pinnate and unbranched, the posterior two 

 short, the rest long, even in proportion to the body. They are not 

 held stiffly as in so many Chi'omodorids but wave about in the 

 M-ater with its motion. (I am not sure whether there is any active 

 motion.) Rhinophores straight and sharply pointed ; distal ones 

 two-thirds perfoliate. They and gills completely retiuctile. 



" Colour. Back appears of a deep red-brown with numerous 

 orange spots, small yet conspicuous to the naked eye. As the 

 orange shows itself elsewhere, we probably really have an orange 

 ground covered with a thick network of purple (as seen under a 

 lens) with small round meshes. This network ends 3 or 4 mm. 

 from mantle-edge, the inner half of the remainder is therefore a 

 deep orange. The outer half is violet, light proximally but almost 

 black in a nari'ow band distally. There is a very fine line of 

 primrose-yellow along the extreme edge of the mantle. The 

 luider side of the animal is pure white, only the violet of the 

 mantle-edge I'eappears on the other side. 



"Besides the meshes of the network the back is niarked l)y a series 

 of clear cut spaces each defined by a darkened line of purple. 

 These spaces, 2 mm. or so in diametei-, may be oval, kidney-shaped, 

 or circular. Those which ai'e near the orange band of the mantle 

 are a clear yellowish white, bxit the rest are clouded with orange 

 centrally and some have an iil-defiued purple spot in the centre. 



'• Gills and anal papilla are orange on theii- inner surfaces (those 

 facing the centre of the cup they form), the rest white with a 

 little oi-ange. 



" Perfoliate parts of iliinophores brown-red passing into purple 

 at tips. A yellow-white line is conspicuous along the anterior 

 side, running vertically, and very fine lines of the same run 

 hOi-izontally on the posterior halves of the perfoliations." 



Mr. Crossland adds that the colour pattern was so complicated 

 and varied so much in different lights, that he abandoned the effort 

 of painting it and only made a black and white sketch. 



In a letter he alludes to " the clear bilobed area behind the 

 i-hinophores," beneatli which the eyes can just be seen. 



The preserved specimen has become of a uniform plum coloiu' 

 and shows no markings, but otherwise is as described by Mr. 

 Crossland. The branciiife and rhinophores ai-e both very long 

 and both completely protruded. The branchife are only 8, but at 

 the base of the hindmost is a small tubercle Mdiich is perhaps 

 the beginning of a growing plume. 



As in the last species the liver is of a very deep black, only 

 partly concealed by the hermaphi'odite gland. The labial arm- 

 ature forms a complete circle, olive in coloiu', and consisting" of 



