ZOOLOGY AND BOTANY, MICROSCOPY. ETC. 4"> 



Salivary Glands of Ticks.* — M. Elmassian describes these in two 

 Ixodidae, Margaropus annulatus and Eyalomma seyyptium, and in Argas 

 persicus one of the Argasinae. There are two pairs of glands, one of the 

 tubular type and the other acinous. The tubular gland of Margaropus 

 annulatus is taken as a type of a gland with mucous secretion. The 

 acinous gland of Hgalomma segyptium is taken as a type of a gland with 

 mixed mucous and serous secretion. The minute details of the process 

 of secretion are described. 



New Species of Argas. | — Georgina Sweet describes Argas victoriensis 

 sp.n.. from a fowl in North Victoria. All other fowl-ticks, so far, 

 examined from Victoria, Xew South Wales, and Tasmania, have been 

 undoubtedly .4. persicus, but this new form seems to be distinct. 



Pacific Pycnogonids.J — Leon J. Cole reports on six Pycnogonids 

 collected by the ' Albatross ' from four stations in the Eastern Pacific : 

 Ascorhynchus agassizii Schimkewitsch, Colossendeis gig as Hoek, and 

 < y . rururbita sp.n., which is closely related to G. gigas, but has a pro- 

 boscis with an upward curve, and the fourth joint of the palp longer 

 than the second. 



Notes on Endeis spinosus.§ — Leon J. Cole reports the abundant 

 occurrence of this Pycnogonid, new to North America, among the 

 colonies of Obelia dichotoma growing on the Sargasso weed drifted into 

 Vineyard Sound. The specimens were inseparable from others from 

 Naples, Plymouth, Norway, and the Tortugas. It seems to have 

 become pelagic on the American side of the Atlantic. The heart showed 

 172 contractions per minute. There appeared to be a real circulation 

 from the body out into the legs and back, but this was rendered more 

 or less indefinite by the peristaltic contractions of the intestine, which 

 imparted a sort of churning motion to the blood and kept it moving 

 back and forward. In a specimen under a cover-glass these peristalses 

 recurred at intervals of two or three seconds. 



e. Crustacea. 



* 



Photophores of Decapod Crustacea.|| — S. Kemp describes the struc- 

 ture of the photophores of Decapod Crustaceans. Photophores only occur, 

 as far as is known, in three types of Decapod Crustaceans, one of them, 

 Sergestes, belonging to the Pemeidea, the other two, Acanthepligra and 

 Holophorus, to the Caridse. The structure is wholly different in the 

 Penaeid and Carid types, but they possess one very striking feature in 

 common : a deep-blue pigment is associated with the luminous organ 

 in both. In Sergestes the photophores are distributed on the lower 

 sides of the eye-stalks, antennules and antennal scales, on the oral 

 appendages, on the thoracic and abdominal sterna, on the ventral surface 

 of the outer uropods, and on many of the leg-joints. In S. challenger i 

 photophores occur in the roof of the branchial chamber, and illuminate 



* Arch. Zool. Exper., v. (1910) pp. 379-419 (2 pis.). 



t Proc. R. Soc. Victoria, xxiii. (1910) pp. 15-18(1 pi.). 



J Bull. Mus. Comp. Zool. Harvard, lii. (1909) pp. 185-91 (3 pis.). 



§ Biol. Bull., xviii. (1910) pp. 193-203 (2 figs.). 



I Proc. Zool. Soc. London, 1910, pp. 639-51 (3 pis.). 



