280 



SE I TA KO GOTO. 



supernumerary somite. This example was brought to my notice a few 

 years ago by a student, to whom a bottle of Li»ia had been assigned for a 

 general study of the crustacean body, and who came up to me with the 

 question whether he or the Ligia was amiss. The occurrence of a super- 

 numerary segment in a malacostracan is, so far as I know, so rare that I 

 have thought it worth while to put it on record. The accompanying cut 

 was drawn to nature by means of a Bausch and Lomb camera lucida for 

 drawing objects in their natural size, from a preparation of the abnormal 

 specimen in question, made by separating each somite and the oral append- 

 ages, and gluing them on to a glass slide with photoxylin. The small 

 structure shown in the middle line below the head is the lower lip, and the 

 oral appendages are, from above downwards, the mandibles, the first 

 maxillae, the second maxillae, and the maxillipedes. 



Literature cited. 



Adolphi, H. 



Albrecht, H. 



Bateson, W. 

 Baur, G. 

 Benham, W. B. 



Bourne, A. G. 



Bumpus, H. C. 



92. 



95- 



'96. 



94. 

 '91. 

 •94. 



'84. 



Ueber Variationen der Spinalnerven und der Wirbelsäule anurer 

 Amphibien. I. (Bufo variabilis Pall ) Morphol. Jahrb , Bd. ig, 

 P- 3t3-375. 



Ditto. II. (Pelobates fuscus W'agl. und Rana esculenta L.) Morphol. 



Jahrb., Bd. 22, p. 449-490. 

 Ditto. III. (Bufo cinereus Schneid.) Morphol. Jahrb., Bd. 25, p. 115- 



142. 



Ein Fall von sehr zahlreichen, über das ganze I'eritoneum versprengten 

 Nebenmilzen. Beiträge z. pathol. Anat. u. z. allgem. Pathol., Bd. 



20. P- 5 1 3-527- 

 Materials for the Study of Variation. 



On Intercalation of Vertebrae. Journ. of Morphol., Vol. 4, p. 331-336. 

 Notes on a particularly Abnormal Vertebral Column of the Bull-frog ; 



and on certain other Variations in the Anuran Column. Proc. 



Zool. Soc. London, p. 477-4S1. 

 On certain Abnormalities in the Common Frog (Rana temporaria). 



I. The Occurrence of an Ovotestis. 2. Abnormalities of the 



Vertebral Column. Quar. Journ. Mie. Sc., Vol. 24, p. 83-88. 

 A Contribution to the Study of Variation. (Skeletal Variations of 



Necturus maculatus Raf.) Journ. of Morphol., Vol. 12, p. 457- 

 479- 



