July, 1846.] 81 



cles. The last joint is armed with two hooked phalanges having placed be- 

 neath them a round and thick soft pad. The abdomen has nine segments. 

 The last abdominal segment, in both sexe3, is furnished with two short 

 eaudal appendages. The external part of the sexual apparatus is articulated 

 with the ventral plate of the seventh abdominal segment. 



Of the digestive apparatus. The oral organs are mandibulate or masticatory. 

 The labium (Fig.3,) is in fourpieces,two of which are external and one longer 

 than the internal. They are somewhat claviculate in shape,have each a black 

 spot at the extremity and articulate with the mentum, properly a fifth piece 

 to the labium. The labial palpi (Fig. 3, a,) articulate with the mentum, are 

 hirsute, and three-jointed, two of the joints being oval and the third lanceo- 

 late in shape. The tongue, (Fig. 4.) which is internal as regards the mouth 

 and is generally considered to belong to the labium, is fiat from side to side, 

 of a curved triangular form, corneous in structure, and ciliate upon its upper 

 edge. 



The maxilla? (Fig. 5,) are tridentate and slightly hairy. The maxillay palpi 

 (Fig. 5, a.) are five-jointed and hirsute ; the first two joints are subrotund, 

 the next two conical, and the last one lanceolate in form. The niandibuke 

 (Fig. 6,) are very hard, short, and strong, and present a triangular molar 

 surface, with two of the sides raised into trenchant, sharp edges, resembling 

 very much a gouge, and well adapted for cutting the harder vegetable sub- 

 stances. The labrum (Fig. 7,) is slightly convex and emarginated. The intes- 

 tinal canal (Fig. 8,) extends in a straight line, the length of the body, from 

 the mouth to the anus, and is broad and capacious throughout. The pharynx 

 is almost null. The cesophagus, at first narrow, after a few lines of its course 

 almost abruptly dilates into a tube of large calibre, extending nearly one half 

 the length of the whole canal, and may be considered in the light of a com- 

 bined crop and cesophagus, as it appears to be a receptacle of the food, in 

 which the latter undergoes some change preparatory to being received into 

 the stomach, and I will, hence, call it the oesophageal crop. (Fig. 8, a.) Its in- 

 ferior part (Fig. 9,) becomes contracted in shape like the neck of a Florence 

 flask, and projects into the cavity of the stomach. The orifice'opening into 

 the stomach is narrow, and has a valve-like appendage connected to its lip. 

 The exterior or muscular tunic of the oesophageal crop is thick and strong i 

 its transverse fibres are well marked. The epithelium is comparatively 

 thick and tightly adherent to its basement membrane. 



Thi3 portion of the alimentary canal I found to be full of coarse particles 

 of decaying wood, which I infer to be the food of the animal. 



The stomach (Fig. 8, b.) is about half an inch in length, and of very little 

 greater breadth than the preceding receptacle. Its parietes are compara- 

 tively thin, and present internally numerous transverse rugae which pass 

 from a longitudinal ruga in front to a corresponding one behind. The 

 muscular investment is very thin ; the epithelial surface is soft and readily 

 separable from the basement membrane, which latter makes up the greater 

 part of the thickness of the stomach. 



The duodenum (Fig. 8, c.) is only distinguishable from the stomach by a 

 narrowing of its capacity and the disappearance of the ruga?. It presents 

 the same structure as the stomach. Its length is about three times that o 



