DESCRIPTIONS OF GENERA AND SPECIES 



199 



between somites x and xi ' ; I imagine that these papillae are in all probability the extruded 

 muscular penis, in which the spermiducal gland of several species terminates. The gizzards are 

 in xvi-xx. 



Moniligaster ruber has a more restricted gizzard than in any other species it is only found in 

 segments xiii, xiv ; but in segments x-xii there are 'soft-walled swellings of the intestine, looking 

 like gizzard only not muscular.' 



Finally, Moniligaster minutus has a gizzard extending through segments xii-xiv only; it has large 

 egg-sacs reaching from the twelfth to the fifteenth segment. 



The species that are sufficiently known, for systematic purposes (including a form 

 described for the first time in the present work) may be thus distinguished : 



(i) Moniligaster deshayesi, PERKIER. 

 M. deshayesi, PERRIER, Nouv. Arch. Mus. 187 a, p. 130. 



Definition. Length, 150 mm. ; breadth, 6 mm. Alimentary canal with a gizzard in VI and 



four gizzards in XIII-XXII ; hearts in VI-IX. Hab. Ceylon. 



This species is the type of the genus ; but unfortunately it is not very clear if 

 it be really different from some of those described by BOURNE. The existence of 

 a gizzard in the sixth segment in addition to the gizzards which lie posteriorly 

 is, so far as can be said at present, the distinguishing character of the species ; but 

 the absence of an anterior gizzard in all the remaining species of the genus renders 

 the supposed presence of this gizzard in Moniligaster deshayesi perhaps just a little 

 doubtful ; the specimen examined by PERKIER was in a poor state of preservation ; 

 hence it is possible that an error has been made. 



The description of this species is illustrated by a number of figures ; these are not all quite 

 intelligible in the light of our present knowledge ; it is above all not clear as to the ' anterior 

 pair ' of male efferent organs (Fig. 79) : the structures termed by PERKIER ' the glands of the seventh 

 segment ;' their minute structure is figured as well as described, and I am still disposed to think 

 that my suggestion that these are the dilated extremities of the spermathecae, while the duct 



