part 1] PROCEEDIXaS of the &EOLOaiCAL SOCIETY. V 



rostrum. These two examples were those to which he had ah-eady 

 referred as having been figured by Huxley, and unfortunately 

 the arms are not well preserved in either of these specimens ; in 

 one (-S. hniguierianus, from the Lower Lias near Charmouth) 

 there are only a few scattered booklets, while the arms of the 

 other {B. eJongatus, froiu the Lower Lias of Charmouth) are 

 represented only b}^ a confused mass of booklets. Of the other 

 fifteen examples, in one there are a few solitar}' booklets ; in 

 ancjtber the number of the arms is very indistinct ; in two the 

 remains of only two arms are preserved ; in one there are traces 

 of three arms ; in two there are indications of three, or possibly 

 four, arms ; in one there is a confused mass of possibly four 

 arms ; and in one there are the remains of four, or possibty of five, 

 arms. In each of the remaining six specimens six arms can 

 be more or less clearly made out, while there is not a single 

 example in which more than six uncinated arms are displayed. 



Of the six examples that exhibit six uncinated arms four are 

 stated to be from the Lias of L3'me Regis : one is from the Lias of 

 Charmouth; and one was obtained from the Lower Liassic shales 

 between Charmouth and Lyme Regis. From a consideration of 

 these specimens, the speaker concluded that the cephalopod repre- 

 sented by these uncinated arms is the animal known as the 

 belemnite, and that the six uncinated arms Avere arranged in three 

 pairs of unequal length, of Avhich the longest pair was lateral, the 

 medium-sized pair probably dorsal, and the shortest pair probably 

 ventral. He considered the presence of tentacular arms to be 

 doubtful. These observations Avere in accord Avith those of 

 Huxley, who, in his 'Memoir' already cited, stated that he had 

 * not been able to make out more than six or scA^en arms in 

 any specimen, nor has any exhibited traces of elongated tentacula, 

 though the sliortness of the arms Avhich have been preserved Avould 

 liave led one to suspect their existence.' 



The speaker regarded certain markings sometimes to be seen on 

 the guard as indicating that during the life of the animal the 

 guard AA'as almost, if not entirely, coA^ered by the mantle, in A\diich 

 case it AA^as highly improbable that the guard AA'as pushed into the 

 soft mud of the sea-bottom in order to act as an anchor. 



He considered the animal to have been a free sAvimmer, swimming 

 forward ordinarily, but AA'hen desirable, capable also of sudden and 

 rapid propulsion backwards. 



A short discussion folloAved, and the thanks of the FelloAvs 

 present Avere accorded to the Lecturer. 



Lantern -slides and specimens of belemnites were exhibited by 

 Mr. G-. C. Crick in illustration of his lectm-e. 



A geological map of Mysore, compiled from the Records of the 

 Department of Mines & Geology, Mysore (scale : 1 inch — 8 miles), 

 1915, AV^as also exhibited. 



