Manchester Memoirs, Vol. Ixv. (192 1), No. 11 5 



The maxilla is unlike that of the Palaemonidae in lacking both 

 the cleft lobes. In this respect it recalls the Anchistioididae and 

 the Crangonoida. The maxillule has both laciniae a good 

 deal drawn out. According to Balss, they are united for some 

 distance at the base. Unfortunately, one of the pair removed 

 from my specimen was accidentally destroyed, and in the other 

 the inner lacinia is missing. The very strong spines which 

 are usually borne at the end of the outer lacinia are in 

 Paratypton reduced to short, conical vestiges, which in the 

 middle of the row almost disappear. In the endopodite, the 

 end lobe is reduced to a low, rounded prominence, and the 

 lobe proximal to it, which is usually curved to hook round the 

 edge of the metastoma, is long and conical, and ends in a very 

 strong spine, like that which in Palaemonidae usually tips the 

 endopodite of the first maxilliped. The lower lip (metastoma) 

 is much like that of the Palaemonidae, but its cleft is partly 

 closed and converted into a gutter, which runs between two 

 fleshy pilasters, and leads to a notch of the edge of the organ, 

 at the sides of which the pilasters end in knobs. The mandibles 

 are placed in a mouth-chamber like that which I have described 

 for the Palaemonidae, bounded behind by the metastoma, in 

 front by the labrum, and at the sides by the bases of the 

 mandibles. They have no palp. Their form is on the whole that 

 of the Palaemonidae, but they show two remarkable features. 

 The molar process is reduced to a conical spike, the end of 

 which, however, is truncated and bears on its edge one large 

 tooth and a row of smaller ones. This apparatus differs a little 

 on the two mandibles. The slenderness of the molar process 

 is a little reminiscent of the Gnathophyllidae. The incisor 

 process ends in what seems at first a plain edge like that of 

 Hapalocarcinus, but is in reality very finely toothed, the 

 notches between the minute, sharp teeth running for a short 

 distance over the surface of the process as parallel furrows 

 separated by ridges continuous with the teeth. At one end of 

 edge is a stouter tooth. The whole has the appearance, not 

 of having arisen by a multiplication of the coarse teeth which 

 are usual on the end of the incisor process, but of being an 

 organ sui generis. The labrum is of the usual Palaemonid 

 form. 



It will be seen that the mouth-parts of Paratypton present 

 no very abnormal feature. Their general aspect is that of the 

 same organs of the Palaemonidae, and in particular the third 

 maxilliped recalls the Pontoniinae ; but certain features are 

 reminiscent of the Gnathophvllidae and Anchistioididae. There 



