. The microscope and its revelations. SHELLS OF BRACHTOPODA 927 be considered to be the animals blood. Of their special function inthe economy of the animal it is difficult to form any probable idea;but it is interesting to remark (in connection with the hypothesis ofa relationship between Brachiopods and Polyzoa) that they seem tohave their parallel in extensions of the perivisceral cavity of manyspecies of Flustra, Eschara, Lppralia, Arc., into passages excavated inthe walls of the cells of the polyzoarv. Professor Sollas finds inthe centre of these prolongations an axial fibre which can be
. The microscope and its revelations. SHELLS OF BRACHTOPODA 927 be considered to be the animals blood. Of their special function inthe economy of the animal it is difficult to form any probable idea;but it is interesting to remark (in connection with the hypothesis ofa relationship between Brachiopods and Polyzoa) that they seem tohave their parallel in extensions of the perivisceral cavity of manyspecies of Flustra, Eschara, Lppralia, Arc., into passages excavated inthe walls of the cells of the polyzoarv. Professor Sollas finds inthe centre of these prolongations an axial fibre which can be tracedbackwards to the nerve-cells of the mantle ; at the distal end is aterminal cell which is connected by a fibril with the axial fibre, andis covered externally by a transparent chitinous layer ; save for theabsence (or the unproved presence) of pigment cells we should bejustified in regarding the processes as organs which are sensitive toluminous impressions. In the family Shynchonellidce, which is represented by onlysix recent
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
