REVIEWS. 



53 



have no knowledge of zoology nor of molluscan anatomy. Part III., after a 

 few pages on which the description of the shell is completed, and a list of papers 

 appertaining to this portion of the subject, deals with anatomy as far as those 

 forms go, which come within the scope of the Monograph. There are 

 generalizations given that apply to the Gastropoda and Pelecypoda, while the 

 snail and fresh- water mussel are described in detail, as types of these classes 

 respectively. This part of the work is elaborately illustrated by original 

 drawings and by others, many of them "after Howes " ; it must be allowed, too, 

 that these latter are seen to greater advantage in the Monograph than on the 

 crowded lithographic plates of Howes' " Atlas of Biology." Some specimens 

 of the illustrations are here given through the courtesy of Mr. Taylor, and 

 Figure "316" will give an idea of the anatomical representations, while 

 Figures "311," " 337," and "329" will shew the detail that is gone into. 



"Fig. 316." Alimentary cinal of Helix aspersa with appended glands 

 dissected out and seen from the right side. The generative, circulatory, 

 excretory and nervous systems removed and the buccal cavity, stomach, 

 bile ducts, intestinal canal and pedal gland opened up (after Howes). 



b.c. , buccal cavity, showing radula, radular sac and jaw ; cr. , crop ; /. , foot ; h.g., 

 hermophrodite gland or ovotestis ; /./., left lobe of liver ; o.c, oesophagus ; 

 p.g., pedal gland; p.r., pharyngeal or buccal retractor; ;., rectum; ;/., 

 postf-rior lobe of the liver ; s.d., salivary duct ; ■i.g., salivary gland ; s.t., 

 stomach ; ty., t\-phlosole. 



The statement is made (p. 1S4) that a fuller account of the organs 

 individually," detailing the difterentiations in structure and function they each 

 undergo and referring to the phylogenetic and other points of interest in con- 

 nection there'.vith ;" the last eight page^ form the beginning of this account 



" Fig. 329." Dsivt c( Hilix aspcisa x 4. 



which should prove exceedingly interestiug to judge by the instalment given 

 which completes the head and its organs and begins the " pedal or ventral 

 region." An interesting figure shews the underside of Helix cispcrsa seen from 

 below through a slip of glass on what it is crawling. 



In conclusion let one say that Mr. Taylor has compiled this portion of his 

 book with such sound judgment that e%en those who have been conchologists 



