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THE AMEBIC AN NATURALIST [Vol. XLIV 



In fact, the lens of the highest objective is enclosed in a brass 

 capsule which is perforated on either side, the perforations 

 measuring about y 2 5 of an inch in diameter. With the highest 

 power there is an extraordinary working distance— one eighth 

 of an inch. The maximum magnification, by the way, corre- 

 sponds roughly with that of a modern Leitz microscope, having 

 a No. 6 objective and No. 1 eyepiece. ' 



The accessories include stage-forceps, a small bull's-eye con- 

 denser, a hand lens, forceps, extra concave mirror, a long 

 handle (?), a plano-concave lens, and ten objects mounted dry 

 in sockets in a wheel-like carrier. The objects are still in place 

 and include pollen, flea, wing of fly, spider and insect scales. 



Bashford Dean. 



STOMATOLEPAS, A BARNACLE COMMENSAL IN THE 

 THROAT OF THE LOGGERHEAD TURTLE 



"While investigating the parasites of the loggerhead, Ca- 

 retta caretta, at the Marine Laboratory of the Carnegie Insti- 

 tution at Tortugas, Florida, Professor Edwin Linton found 

 numerous small barnacles partially imbedded in the mucous 

 membrane of the upper end of the gullet. Many sessile bar- 

 nacles are known to live externally on marine turtles, whales, 

 etc., but up to this time none has been known living internally. 1 

 One group of Cirripedia. the Rhizoccphala, consists wholly of 

 parasitic forms which penetrate their crustacean hosts through 

 the external integument. The barnacle discovered by Professor 

 Linton which we will call Stomatolepas, seems to be the first 

 commensal form of the thoracic cirripedes. 



Stomatolepas has about the size and shape of a split pea, the 

 oral surface being flattened. The calcareous Avails form a shallow 

 bowl which is imbedded about half of its depth in the membrane 

 of the gullet or posterior part of the mouth of the host. 

 Stomatolepas prsegustator n. sp. 



The walls form a very broad, shallow cup, nearly circular in 

 contour, and about twice as wide at the opening as at the base. 

 The base is flat, circular, excessively thin, but sufficiently calci- 

 fied to be rigid and retain its shape when dried. The plates of 

 the wall are composed of two layers, an inner layer, thin, dense 

 and transparent, and an outer covering of several layers of thin- 



