Henry L. Bruner 31 
maxillaris, with which the sinus is connected at different points: (a) 
Under the anterior part of the bulbus, where sinus and vein come close 
together, they are connected by a short vertical vein (c. m., Text Fig. 
4), which penetrates the floor of the orbit between the maxillary and 
palatine bones. (0) The posterior prolongation of the sinus, which ac- 
companies the lachrymal gland, communicates with the vena mavxillaris 
by two or more short veins. The first of these (c. m’., Text Fig. 4) 
crosses above the vena maxillaris and joins it on the median side, behind 
the junction of the vena palato-maxillaris with the maxillary vein. 
The other veins, varying somewhat in position and number, run from 
the more posterior part of the sinus orbitalis to the adjacent parts of the 
vena maxillaris. 
The most conspicuous tributary of the sinus orbitalis is the vena palpe- 
brals, which, with its two tributaries, the vena palpebralis inferior and 
vena palpebralis superior, forms an incomplete ring around the bulbus 
near the bottom of the cutaneo-palpebral furrow (sinus cutaneo-palpe- 
bralis of Ficalbi, 88). 
(1) The vena palpebralis of Tropidonotus (v. p., Text Fig. 4) is a 
short vein which is formed in the posterior part of the orbit by the union 
of the inferior and superior lid veins. The trunk vessel runs caudad a 
short distance, then bends mesad and discharges into the sinus orbitalis. 
(2) The vena palpebralis inferior (v. p. t.) begins ventral to the pos- 
terior end of the lachrymal duct, where, also, the vein communicates with 
the vena maxillaris. From its origin the vein runs caudad beneath the 
bulbus, following the margin of the preocular curtain, until it meets 
the vena palpebralis superior. 
(3) The vena palpebralis superior (v. p. s.) has its origin in the sinus 
orbitalis under the anterior part of the bulbus, whence it runs dorsad 
vena cerebralis anterior; c. i., internal secondary anastomosis between the 
vena cerebralis media and vena cerebralis anterior; c. m., c. m’., anastomoses 
between sinus orbitalis and vena maxillaris; s. 0., sinus orbitalis; s. p. m., 
sinus palatinus medius; s. p. p., sinus palato-pterygoideus; s. s. i., sinus sub- 
nasalis intermedius; s. s. J., sinus subnasalis lateralis; s. s. m., sinus sub- 
nasalis medius; s. s. ¢., sinus subnasalis transversus; s. v. n., sinus vestibuli 
nasi; v. c., vena cutanea; v. c. a., vena cerebralis anterior; v. c. d., vena capitis 
dorsalis; v. c. l., vena cervicalis lateralis; v. c. m., vena cerebralis media; 
v. C. Mm. &., vena cerebralis media secunda; v. c. p., vena cerebralis posterior; 
v. hy., vena hypophyseos; v. j. i., vena jugularis interna; v. 1. c., vena longi- 
tudinalis cerebri; v. m. d., vena mandibularis dextra; v. m. s., vena man- 
dibularis sinistra; v. mx. d., vena maxillaris dextra; v. mz. s., vena maxillaris 
sinistra; v. n. e. d., vena nasalis externa dorsalis; v. n. e. v., vena nasalis 
externa ventralis; v. p., vena palpebralis: v. p. c., vena palato-cerebralis; 
v. p. 1., vena palpebralis inferior; v. p. 0., vena palatina obliqua; v. p. s., vena 
palpebralis superior; v. r., vena rostralis; v. sp., vena spinalis. 
