.']G2 EDWARD S. MOUSE ON 



rim iiiid foliated williiii. It is lield lirmly to tlic hody wall l)y the ilio-parictal liaiid 



(47; !)• This hand is dividcil iuto several strands, oiie nf whicli, rather wide, jmsses 



directly hehind the nephrostome and is attached to tlie hody wall; another, very 



nai-row, passes ohliquely backward to the hody wall, and still another, a very narrow one, 



passes ohliquely backward toward the median line. The appearance of the inner portion 



of the nephrostome is shown iu 54: Ki. The blood in active circulation is seen rushing 



through the various lacunae which cover the surface of the nephnjstome. The wdiole 



oro-an is highly vascular throughout and it would seem that the endothelial lining of the 



coelomic cavity ensheathed every organ within. The body of the nephridium is a rich 



orano-e color, and in L. Icji'iiliihi the cohir is so persistent that after a lapse of twenty 



years, in alcohol, tlie coloi- through the shell appears just as bright. The body of the 



ne[)hiidium in (ilottidia has an oblong, slightly ovate form, narrowing (|uite rapidly to its 



outer termination; it has a few wide longitudinal markings which probably indicate folds 



within. In L. lepldahi (54: 11, vi, i;j), the nephridia occupy precisely the same position 



as in Glottidia. The nephro.stoaie is s )mewliat different; iu shape it is like a cup with 



the rim sharply reflected, and just below tiie rim a deep constriction, and then the wall 



rounds out again to taper rapidly to the body of the nephridium whicli it joins at nearly 



right angles to its axis (48: 4, S). The side of the nephrostome next to tlie coelomic wall 



is so closely adherent to it that the wall itself forms i)art of the border of the nephrostome 



(see particularly, 54: 12, 13). In Glottidia and />. (HKit'ina, the rim of the nephrostome is 



entire, while in L. hpidula the rim merges with the body wall. The folds within the 



nephrostome (54: 14, 14rt) are in the form of loops giviug the appearance of a deep 



fluting. The folds are strongly ciliated and the ciliary action is vigorous. No current 



was seen to pass through the uephridium ; corpuscles were drawn into the nephrostome 



only to be whirled out again. Here is an evidence that iu some way the animal controls 



the discharge of matter tlu'ough it. In Terebratulina, I have followed au egg from its 



release from the pallial sinus to its entrance into the nephrostome and linal discharge at 



the exterior opening (58 : 4) . There are a few branching lacunae ou the walls of the 



nephridium which is a rich, dark orange, and the color is so pronounced as to show through 



the shells. The tube follows along the side of the coelomic wall aud passing through it 



obliquely, opens on the anterior wall. The external openings appear as simple slits 



(48: 4,*^)- The nephridia of L. anathia are not unlike those of Glottidia. The body is 



thick, wide, flattened, aud glandular ; the nephrostomes seem a little more closely appressed 



to the coelomic wall and the folds converge slightly to the anterior end, as such lines 



would ou an oblong and tapering body. The folds are finer and run parallel to the iuuer 



incurving outline of the nephridium. These folds are a rich maroon color. A reference 



to 55 : 1 will better explain these features. The nephrostome is not so deep as in Glottidia 



