. Geological magazine . a Limulus or a seed. At anexhibition by Architects held last year at Prague I saw a specimenof a similar fossil with two of its appendages preserved, and I wasfortunate enough to acquire the same for our Museum. I then re-examined all ray material previously collected, and found appendagesin other specimens also. Several plates with drawings of theseobjects will appear in the second part of the fourth volume of mywork, Fauna der Gaskohle, but as this work will require morethan a year before it can be published, I hasten to give a preliminarysketch of this Permian Xiphos
. Geological magazine . a Limulus or a seed. At anexhibition by Architects held last year at Prague I saw a specimenof a similar fossil with two of its appendages preserved, and I wasfortunate enough to acquire the same for our Museum. I then re-examined all ray material previously collected, and found appendagesin other specimens also. Several plates with drawings of theseobjects will appear in the second part of the fourth volume of mywork, Fauna der Gaskohle, but as this work will require morethan a year before it can be published, I hasten to give a preliminarysketch of this Permian Xiphosure, which I dedicate to my friendDr. Henry Woodward, one of the chief authorities on fossil Crustaceain England. 1 La Creation et ses Mysteres devoiles. - Yol. xxv (1882), p. 243. ^ Second edition (1S89), chap. xxv. 58 Dr. Anton Fritsch—On Prolimulus Woochcardi The body consists of two rounded shields, with thickened marginsmeasuring 13 mm., the telson is 14 mm. in length, the whole lengthof the specimen being 27 Diagrammatic sketch of Frolimuliis Woodwardi, Fritsch, enlarged four times. The dorsal surface is generally covered with, some calcareouscoiled discoidal tubes of Spiroglyphus vorax, Fr. On the ventralpart of the cephalothorax (if made wet with gum-arabic) five pairsof extremities can be detected, the first being very stronglj curvedinwards, the fifth long and slender, being supported by a sternalelement. On the ventral surface of the abdomen we can see rounded plates,probably the modified abdominal appendages covering the respiratoryorgans, or branchise. The telson is inserted in an invagination of thehinder margin of the abdomen. I hope that the galvanoplastic casts which I have had prepared ofsome of the developed natural impressions will help us to recognizemore of the details of the structui-e of this Permo-Carboniferousking-crab. Prolimulus very closely resembles one of the embryonicstages of the living North American Limuliis polyphcemus. H. W. MoncUon
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