M. A. Stecker on a neio Genus of Arachnida. 239 



As regards the digestive apparatus^ the buccal cavity opens 

 first into a narrow oesophagus, which afterwards widens and 

 passes directly into the stomachal part ; upon the stomach, as 

 in the Phrynida?, Chernctidaj, and Scorpionida?, no caica can 

 be distinguished. The portion of the intestinal tract following 

 the stomach, the small intestine, forms an elongated spacious 

 tube, separated by a constriction from the rectum, which is 

 dilated as in the Scorpions and Acarida, but in its pyriform 

 shape resembles the rectum of many Hemiptera. As regards 

 the structure of the stomach and small intestine, we distinguish 

 in them a membrana propria^ on the inner surface of this 

 the digestive cells, and on its outer side the tunica muscular is. 

 In the tunica muscuJaris the stratum of transverse muscular 

 fibres which give the whole organ a transversely striped ap- 

 pearance may be recognized without difficulty. The digestive 

 cells are spherical or cubical, and have a diameter of 0'03 

 raillim. The stomach and small intestines strikingly re- 

 semble the corresponding parts of the digestive apparatus 

 described by Dr. L. Landois * in Hemiptera ( Cimex lectu- 

 larius). At the commencement of the small intestine two 

 Malpighian vessels of considerable length open into it. They 

 differ remarkably from the Malpighian vessels of other Arach- 

 nida, inasmuch as they become much ramified at once in 

 the middle, to make their appearance again after a time as 

 simple looped canals. They run in many convolutions through 

 the liver. On the upper lateral diverticula of the stomach a 

 small oval salivary gland is attached on each side by fibrous 

 bands ; their structure agrees with that of the spherical glands 

 of the different Hemiptera [Gimex^ Capsus) described by 

 Ldon Dufourf and Landois {I. c. p. 216). I was not fortunate 

 enough, however, to observe the discharge of these salivary 

 glands ; they probably discharge by a much convoluted canali- 

 culus into the long oesophagus, and serve for the stupefaction of 

 the prey. Besides these we find two pairs of ducts on the 

 intestinal tract, which perhaps serve to unite the liver with 

 the intestine ; such hepatic discharges have already been de- 

 scribed and figured by Dug^s J. The accessory glands dis- 

 covered by Lubbock § and Krohn || in Phalangium opilio^ 

 discharging in the anterior half of the abdomen upon the 



* Zeitschr. fiir wiss. Zool. 18G8, Bd. xviii. p. 206. 



t " Recherches Anatomiques et Physiologiques siir lea Hemipleres," 

 Mem. pres. a I'Acad. Roy. de France, tome iv. (1833), pp. 129 et seqq. 



X Aiinales des Sci. Auat. 1836. 



§ Phil. Trans. 1861, p. 610. 



II Archiv fur Naturg. xxxi. (1865), p. 41, Taf. 3a ; Ann. & Mag. Nat. 

 Hist. 1865, ser. 3, vol. xvi. p. 149. 



