bESCRtPTlON OF A NIlW GENtJS OF IXODES. 287 



cither to abandon the distinction between Navicula and 

 Pinnularia, or to institute a new genus to receive such 

 forms as exhibit the peculiar characteristics of both genera. 

 The former alternative seems the simpler, and I am there- 

 fore disposed to adopt it. 



Description of a New Genus of Ixodea. By Alex. 

 Macalister, M.B., Professor of Zoology, University of 

 Dublin. (Plate XIV, figs. 5—8.) 



The specimens of this parasite Avhich I have examined I 

 obtained from the skin of the many shielded pangolin of West 

 Africa {Manis multiscutata), and as I have not met with any 

 notice of a similar arachnidan, 1 conclude that the form 

 is as yet undescribcd, and as its distinctive characters seem 

 of generic value I propose for the genus the name Adeno- 

 pleura. The following will be its characters : 



" Body compressed, rostrum dentate with flattened 

 recurved many rowed hooks ; abdomen witli two lateral 

 glandular sacs opening on the surface." 



The species I would suggest to call A. compressum, with 

 the following specific characters : 



" Body very much flattened, obovate, posteriorly dentate, 

 deep chestnut brown ; rostrum clavate, matter more than 

 once and a half as long as the basilar piece ; claws two, 

 uncinate, Avith an oval caruncle at base ; length, 1-lGth of 

 an inch." 



Both of my specimens were females, and they Avere both 

 firmly connected to the skin of their host, \\'\\\\ the rostrum 

 buried in the surface of the soft under side of the animal. 

 The rostrum is '0125 of an inch long, double, and clavate, 

 with parts of three rows of the recurved, blunt-pointed, 

 hook-like teeth, with which it is beset, exposed. There are 

 thirteen of these rows of teeth visible altogether on this very 

 formidable beak, but the lowest six rows of these are closely 

 adpressed, and look more like imbricated scales than teeth. 

 The summit teeth are the smallest, sharpest, and most nu- 

 merous. The mandibles are irregidarly annulatcd on their 

 surface. The palpi are somewhat clavate, with three joints, 

 beset with hairs. 



The surface integument of the dorsum is covered with 

 irregularly undulated ridges, like the papillary ridges of the 



