82 PROCEEDINGS OF THE ACADEMY OF [Feb., 



a nearly spherical base aud a cylindrical neck slightly dilated at its 

 free dorsal extremity. The two. parts are of about equal length, 

 the base being about three times, and the neck one and one-half 

 times the diameter of the duct. The ampulla stands vertically by 

 the side of the oesophagus, above which the neck rises. The bul- 

 bous base is in contact with the side of the oesophagus and the con- 

 tiguous tissues of the two are continuous, but whether an actual 

 communication between the cavities of the two organs exists could 

 not be demonstrated beyond question. A few spermatozoa are 

 present in the cavities of both ampulla and duct of the specimen 

 sectioned. A lateral view of the right spermatheca is shown in 

 fig. 1, which sufficiently exhibits the general cellular constitution 

 of its walls, and its topographical relation to the oesophagus, which 

 is shown in outline. 



Although its distortion prevents an accurate measurement, the 

 sperm funnel appears to be only two and one-half times as long as 

 wide; highly glandular. The vas deferens is coiled and reaches to 

 the posterior end of XV before returning to the male pore ; it has a 

 total estimated length of from six to eight times the fimnel. Its 

 two limbs have an equal diameter, which is about one-tenth to one- 

 twelfth of the body at the same point. 



The brain is anteriorly slightly concave, posteriorly nearly straight, 

 with a slight median concavity and feebly prominent postero-lateral 

 lobes." 



Some of the characters used to distinguish E. marinus from the 

 widely distributed E. albidus Henle, 1837 (= Halodrillus littoralis 

 Verrill, 1874), are doubtless due to the immaturity of the speci- 

 mens, but this cannot be true of the absence of the pepto-nephridia, 

 the form of the spermatheca, and the peculiarities of the setae. I 

 have repeatedly studied E. albidus at Wood's Hole (where it 

 abounds) and elsewhere, and have found no connecting variations. 



Prof. Verrill writes that the species was common in the upper 

 littoral zone, below the tide mark of ordinary tides, at Coney 

 Island, but was not noticed elsewhere. The collection contains 

 two specimens labeled " No. 940, High-water mark, Bermuda, 

 1898." 

 Pontodrilus arenae Mich. 



This species ajjjjcars to be of common and very general occur- 

 rence at and below high-tide mark. In almost alKcases the intes- 



