390 SELECTED NOTES. 



not far from the surfaces in any case. In a fissure, near the centre 



of the lobe, are what I take to be some much larger starch grains; 



they are three or four times the size of the others, and are heavily 



scored, reminding one of the knotted appearance of raw tapioca. 



There is usually supposed to be 51 per cent, of fat, and 11 per 



cent, of starch in the cacao-bean, besides 7 per cent, of gum. 



Can the large cells I have referred to be gum ? 



Hahnemann Epps. 



Caprella linearis is popularly known as the "Skeleton 

 Shrimp " and belongs to the sub-class L^modipoda, a division of 

 the sessile-eyed Crustacea. The sub-class derives its name from 

 the circumstance of having the first pair of legs placed very far 

 forward, under the throat, as it were. The abdomen is qmte 

 rudimentary, there is no carapace, and the two first segments of 

 the thorax are amalgamated with the head, and carry the first pair 

 of legs Normally there are seven pairs of hooked feet in the 

 adult animal, but in this genus the third and fourth pairs are 

 aborted, and their place is taken by two oblong membranous sacs, 

 which act as respiratory organs. In the female the ovisacs, con- 

 taining numerous good-sized eggs, are also placed here. The last 

 pair of legs are articulated on the outer end of the last body- 

 segment, but in some species one or two minute segments may be 

 found projecting beyond them. There are two pairs of antennae, 

 a larger and a smaller pair, consisting each of several joints. The 

 L^MODiPODA are all marine. Of the genus Caprella Gosse 

 enumerates nine species, but C. linearis is the one most generally 

 met with, and is tolerably common. In some large old specimens 

 I have found numerous fine, circular crystals-probably carbonate 

 of lime— which show brilliant colours with the polariscope. 



J. H. Green. 



Elytron of Cricket.-This object gives members an opportun- 

 ity of studying the mechanism of a very curious musical instru- 

 ment In Science Gossip for Dec. (? 1882), is an article on the 

 subject, which is highly interesting. The " file " consists of about 

 230 teeth, mounted on a ridge elevated above the surface of the 

 elytron. The elytra are opened and shut so rapidly as to be 

 undefinable by the eye during the operation. The shrill sound 



