STRUCTURE OF THE BRAIX OF THE SESSI I.E-EVED ORUHTACEA. 109 



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 Jan. 23, IrttiO. 



KnoiiN. ITcber die yerdauui)i;siiervon (les Krebses. Isis, 1834. 



Le.moixe. Eeclierchos pour servir a I'histoire tics systiMiies ih'imiin musrulain' ot slaiidnlairo do rccrevissfi. 

 Ann. des sciences nat. 5'" s6r. Zoologie, ix, 1868. 



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 dii lioiuard. Ann. des sciences nat. 4"^ s(^r., Zoologie, xv, ISlil. 



Ueber die fciuerer Structnr des Kopfganglions bei den Knd)sen, besonders beini Pali minis iDCiiKta. Jleni. 



Acad. imp. sc. St.-Petersbonrg, vi, No. 10, 1863. 



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MEROSTOMATA. 



Milne-Edwards, A. Recherches sur Fanatomie des Limules. Annales des sciences nat. Zoologie, xvii, Nov. 

 1872. 



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luterual structure of the brain of Linnilus. Amer. Nat., xiv, 445. June, 1880. 



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EXPLANATION OF PLATES. 

 Plate I. — Asellus communis. 



Fig. 1. LoDgitiidinal .section through the head on one side of mouth and oesophagus, showing the brain or procerebrum 

 {pern), first and second autennal ganglia; mandibular, first and second maxillary, the maxillipedal ganglia 

 and nerves passing to the antenna> and mouth-parts x 1| in(^h A. 



Fig. 2. Section through the procerebral lobes in front of the optic nerves X i A. 



Plate II. — Asellus communis. 



Fig. 4. Section of the procerebrum posterior to Fig. 3, x i A. 



Fig. 3. Section through procerebrum and main commissure X i A, .3a, ganglia cells from lobe b. X i C. 



Fig. 5. Section through the median line of the head, involving the oesophagus and one of the procerebral lobes. 



Fig. 6. Section through the head, x i A. 



Fig. 7. Section of the head passing through one side of the tirst autennal ganglion and .showing the origin of the first 



antennal nerve; also the second antennal ganglion, and mandibular ganglion {md.rj) X i A. 



Fig. 7a. Section passing near 7 and through the main commissure. 



Plate III. — Asellus communis. 



Fig. 8. Section passing through the main commissure from the procerebral to the Ist pedal ganglion. 

 Fig. 9-18. Horizontal sections from the top of the head downwards X z A. 



