14 ART. 1. — CHARLES ELIOT: 



tlie edges are not raised. The rhinophores are large and tear 

 about 40 brown perfoliafcions. The branchiae are six (rarely seven) 

 and tripinnate. The pocket appears to be normally 6-stellate 

 but is often distorted, and in one specimen is spread out like a 

 cup. 



When the body is opened, the large coal-black blood-gland 

 is a conspicuous object. It is in two divisions. Uncertain traces 

 of a labial armature were found. In young specimens the labial 

 cuticle was found to bear a collection of minute rods, so small 

 and transparent as to be visible only under the highest power. 

 In larger specimens it bears scales and granules rather than rods 

 and they are not combined into a plate such as is usually called 

 a labial armature. In two specimens the radula consisted of 70 

 and 80 rows respectively with a formula of about 150. 0. 150. 

 The teeth are white, simply hamate, rather elongate and grace- 

 ful. They are not denticulate and maintain their shape through- 

 out almost the whole of the row. But the last but one is 

 thinner and lower than the others and the outermost of all is 

 degraded, not regularly serrulate but sometimes bearing minute 

 indentations on the top. 



The genitalia show the peculiarities characteristic of the 

 genus. Both the vas deferens and vagina are lined with a very 

 thick muscular cuticle, thrown up into strong zigzag fords. The 

 vas deferens is armed with numerous slightly curved spines each 

 arising out of a circular disc. They are set not in rows but in 

 rather irregular quincunces. In the vagina the folds do not bear 

 true spines but knobs and prominences and in the lower part 

 the portions between the folds are thickly studded with small 

 tubercles. The spermatotheca is large and filled with greenish 

 matter : the spermatocyst is elongate but crumpled and at the 

 end of the vas deferens is an accessory gland. 



After comparing those specimens with the Doris speciosa 

 preserved in the British museum I have no hesitation in saying 

 that the animal described by Abraham under that name is the 

 young stage of this Platydorh. The species must therefore keep 

 the name he gave it. He gives the number of branchiae as seven. 



