JOURNAL 



OF THE 



ROYAL MIOROSCOPIOAL SOCIETY. 



FEBRUARY 1889. 



TRANSACTIONS OF THE SOCIETY. 



I. — Observations on the Special Internal Anatomy of 

 Uropoda Krameri. 



By Albert D. Michael, F.L.S., F.Z.S., F.R.M.S., &c. 



{Read Qth January, 1889.) 

 Plate I. 



The anatomy of the exo-skeleton, and of the trophi, of Uropoda has 

 already been studied and figured by M. Megnin,* who selected 

 U. vegetans for his purpose ; and in many particulars by Dr. Kramer ; t 

 and lately in the undermentioned paper by Herr W. Winkler. 

 I therefore confine these observations to the internal anatomy, and 

 I shall only mention such parts of the external structure as it may be 



EXPLANATION OF PLATE I. 



05, CEsophagus. (»', Enlargement of same before entering the ventriculus. i\ Ventri- 



culus. c, Colon, r, Eectum. a, Anus (seen through the rectum from the 



transparency of the latter), cee, Larger cseca of the ventriculus. c^e', Smaller 



ditto, mv, Malpighian vessels, mv^. Ditto, narrow neck where the vessel arises. 



mv'^. Ditto, enlarged chamber. mv^. Ditto, narrow part between the chamber 



and the lateral enlargement. mv*. Ditto, lateral enlargement. mv^, Ditto, 



anterior narrow portion, mv'^, Ditto, reliesed portion, mv''. Ditto, blind end. 



m. Muscles with tendinous attachments. mS Attachment to the side of the body. 



t^, t"^. Testes, v s. Sack-like organ (vesicula seminalis ?). g, g, Oil-glands, d e. Ductus 



ejaculatorius. 2^> Penis. ar, Protecting armature of same. ov, Central ovary. 



od, Oviducts, e, e, The fully, or nearly fully, developed eggs contained therein. 



t)a, Vagina, res, Vestibule. grj>. Genital plate. 6r, Brain (so called). 



All the figures represent Uropoda Krameri. 



Fig. 1. — Under-side of adult female x 55. The genital plate would fill up the 



genital aperture exactly. The small space necessarily left between the 



two in the figure is to keep the lines distinct. 



„ 2. — Epistome and oral tube of adult, seen from above, X 175. The basal joints 



of the palpus are indicated on the left side only. 

 „ 3. — The same, seen from the side ; same amplification. 



„ 4. — Chelate portion of the right mandible of adult male, seen from the right 

 (outer) side, x 350. 



* " Memoire sur I'organisation et la distribution zoologique des Acariens de la 

 Famille des Gamaside's," Journ. de I'Anat. et de la Physiol. (Kobiu), 1876, pp. 288- 

 336. 



+ "Zur Naturgeschichte einiger Gattungen aus der Familie der Gamasiden,' 

 Archiv fiir Naturgesch., 1876, pp. 28-105. 



1889. B 



