ANATOMY OF MEGAPTERA LONGIMANA. 11 



towards the symphysis, within about 5 inches at the sides. 

 When the carcase lies on the belly, plaitings are thus visible 

 below the mandible. Where the skin turns in from this to 

 below the throat the plaitings present white patches, and this 

 part is seen to form a projection, like a second chin, in 

 figure 1 when the carcase lies on the back. A little behind 

 this two of the furrows terminate, two of the plaitings having 

 bifurcated backwards at the fore part of the throat. All of the 

 long furrows are not continued throughout the length of the 

 plaited area. Thus, the second and third furrows below the axilla 

 are confluent backwards at about 2 feet in front of the axilla ; 

 a furrow at about half-way between the axilla and the mesial 

 line ends opposite the axilla ; and the fourth furrow below that 

 one, mesial or nearly so, stops about 2 feet farther back, and is 

 the lower limb of a furrow which has bifurcated backwards 

 about 5 feet in front. The furrows seen in figs. 1 and 5 are 

 exactly as in the photographs. I could not ascertain whether 

 the furrowing is quite symmetrical. 



10. DERMAL TUBERCLES ON THE HEAD (see fig. 5). These 

 large dermal tubercles rise to a height of 1 inch, one or two of 

 the posterior of the median row to 1 J inch. They are elongated 

 antero-posteriorly. All are soft when pierced. On the upper 

 jaw the median row has seven tubercles, at distances varying 

 from 6 to 12 inches, which are connected by a low median ridge. 

 The lateral row has eight on the right side, eleven on the left, 

 but arranged in pairs except the foremost and hindmost, and are 

 therefore at longer intervals than in the median row. On the 

 mandible there are, along the side, six, the two hindmost low 

 down, the other four arranged in a row high up ; and close to 

 the symphysis there are six on each side, forming an irregular 

 cluster, placed mostly below the middle of the symphysis, the 

 tubercles projecting like the end of a hen's egg, some twice 

 that size. There are thus twenty-six great tubercles on the 

 upper jaw, twenty-four on the lower. 



11. HAIRS. Most of the hairs seen on the lower lip had 

 disappeared before I could attend to them. The eight which I 

 took out vary from f to 1 inch in length, are white and pretty 

 stiff. They were readily seen by standing sideways to the 

 tubercles. They projected J to J inch and came out easily 



